blissful (adj.) Look up blissful at Dictionary.com
late 12c., blisfulle, from bliss + -ful. Related: Blissfully; blissfulness.
blister (v.) Look up blister at Dictionary.com
"to become covered in blisters," late 15c.; "to raise blisters on," 1540s, from blister (n.). Related: Blistered; blistering.
blister (n.) Look up blister at Dictionary.com
c. 1300, perhaps via Old French blestre "blister, lump, bump," from a Scandinavian source (compare Old Norse blastr "a blowing," dative blæstri "swelling"), or from Middle Dutch blyster "swelling;" perhaps from PIE *bhlei- "to blow, swell," extension of root *bhel- (2) "to blow, inflate, swell;" see bole.
blite (n.) Look up blite at Dictionary.com
spinach, or plants like it, early 15c., from Latin blitum, from Greek bliton, which is of unknown origin.
blithe (adj.) Look up blithe at Dictionary.com
Old English bliþe "joyous, kind, cheerful, pleasant," from Proto-Germanic *blithiz "gentle, kind" (source also of Old Saxon bliði "bright, happy," Middle Dutch blide, Dutch blijde, Old Norse bliðr "mild, gentle," Old High German blidi "gay, friendly," Gothic bleiþs "kind, friendly, merciful").

Rare since 16c. No cognates outside Germanic. "The earlier application was to the outward expression of kindly feeling, sympathy, affection to others, as in Gothic and ON.; but in OE. the word had come more usually to be applied to the external manifestation of one's own pleased or happy frame of mind, and hence even to the state itself." [OED]
blither (v.) Look up blither at Dictionary.com
1868, variant of blether "talk nonsense," 1520s, a northern British and Scottish word, from Middle English blather (see blather (v.)). Related: Blithered; blithering.
blithering (adj.) Look up blithering at Dictionary.com
1880, present participle adjective (from the first typically with idiot) from blither (v.) "to talk nonsense." From 1872 as a verbal noun.
blithesome (adj.) Look up blithesome at Dictionary.com
1724, from blithe + -some (1). An adjective from an adjective. Related: Blithesomely; blithesomeness.
blitz (n.) Look up blitz at Dictionary.com
"sudden overwhelming attack," 1940, shortening of blitzkrieg (1939). The use in U.S. football is from 1959. As a verb, 1940, from the noun. Related: Blitzed; blitzing.
blitzkrieg (n.) Look up blitzkrieg at Dictionary.com
"rapid attack," 1939, from German Blitzkrieg, from Blitz "lightning" (from Middle High German blicze, back-formation from bliczen "to flash," from Old High German blecchazzen "to flash, lighten" (8c.), from Proto-Germanic *blikkatjan, from PIE root *bhel- (1) "to shine, flash, burn;" see bleach (v.)) + Krieg "war" (see kriegspiel).
blizzard (n.) Look up blizzard at Dictionary.com
"strong, sustained snowstorm," 1859, origin obscure (perhaps somehow connected with blaze (n.1)); it came into general use in the U.S. in this sense in the hard winter 1880-81. OED says it probably is "more or less onomatopœic," and adds "there is nothing to indicate a French origin." Before that it typically meant "violent blow," also "hail of gunfire" in American English from 1829, and blizz "violent rainstorm" is attested from 1770. The winter storm sense perhaps is originally a colloquial figurative use in the Upper Midwest of the U.S.
bloat (n.) Look up bloat at Dictionary.com
1860 as a disease of livestock, from bloat (v.). Meaning "bloatedness" is from 1905.
bloat (v.) Look up bloat at Dictionary.com
1670s, "to cause to swell" (earlier, in reference to cured fish, "to cause to be soft," 1610s), from now obsolete bloat (adj.), attested from c. 1300 as "soft, flabby, flexible, pliable," but by 17c. meaning "puffed up, swollen." Perhaps from a Scandinavian source akin to Old Norse blautr "soaked, soft from being cooked in liquid" (compare Swedish blöt fisk "soaked fish"), possibly from Proto-Germanic *blaut-, from PIE *bhleu- "to swell, well up, overflow," an extension of root *bhel- (2) "to blow, inflate, swell" (see bole).

Influenced by or combined with Old English blawan "blow, puff." Figurative use by 1711. Intransitive meaning "to swell, to become swollen" is from 1735. Related: Bloated; bloating.
bloated (adj.) Look up bloated at Dictionary.com
"overgrown," 1660s, past participle adjective from bloat (v.). Figurative sense by 1711.
blob (n.) Look up blob at Dictionary.com
"drop, globule," 1725, from a verb meaning "to make or mark with blobs" (early 15c.), perhaps related to bubble. The same word was used 16c. in a sense "bubble, blister."
bloc (n.) Look up bloc at Dictionary.com
1903, in reference to alliances in Continental politics, from French bloc "group, block," from Old French bloc "piece of wood" (see block (n.)).
block (v.) Look up block at Dictionary.com
"obstruct," 1590s, from French bloquer "to block, stop up," from Old French bloc (see block (n.)). Meaning "to make smooth or to give shape on a block" is from 1620s. Stage and theater sense is from 1961. Sense in cricket is from 1772; in U.S. football from 1889. Related: Blocked; blocking.
block (n.) Look up block at Dictionary.com
"solid piece," c. 1300, from Old French bloc "log, block" of wood (13c.), via Middle Dutch bloc "trunk of a tree" or Old High German bloh, from a common Germanic source, from PIE *bhlugo-, from *bhelg- "a thick plank, beam" (see balk).

Meaning "mould for a hat" is from 1570s. Slang sense of "head" is from 1630s. Extended sense of "obstruction" is first recorded 1640s. In cricket from 1825; in U.S. football from 1912. The meaning in city block is 1796, from the notion of a "compact mass" of buildings; slang meaning "fashionable promenade" is 1869.
BLOCK. A term applied in America to a square mass of houses included between four streets. It is a very useful one. [Bartlett]
blockade (v.) Look up blockade at Dictionary.com
late 17c., from blockade (n.). Related: Blockaded; blockading.
blockade (n.) Look up blockade at Dictionary.com
mid-17c., from block (v.) + -ade, false French ending (the French word is blocus, 18c. in this sense, which seems to be in part a back-formation from the verb bloquer and in part influenced by Middle Dutch blokhuus "blockhouse").
blockage (n.) Look up blockage at Dictionary.com
1827, from block (v.) + -age.
blockbuster (n.) Look up blockbuster at Dictionary.com
also block-buster, big bomb (4,000 pounds or larger, according to some sources), 1942, from block (n.) in the "built-up city square" sense. Entertainment sense is attested from 1957. U.S. sense of "real estate broker who sells a house to a black family on an all-white neighborhood," thus sparking an exodus, is from 1955.
blocker (n.) Look up blocker at Dictionary.com
c. 1400 of a tool, c. 1600 of a person, agent noun from block (v.). U.S. football sense from 1914.
blockhead (n.) Look up blockhead at Dictionary.com
also block-head, "stupid person," 1540s (implied in blockheaded), from block (n.) + head (n.); probably originally an image of the head-shaped oaken block used by hat-makers, though the insulting sense is the older one.
blockhouse (n.) Look up blockhouse at Dictionary.com
c. 1500, of uncertain origin (see blockade (n.)). Also in 16c. French, Dutch, German.
blocking (n.) Look up blocking at Dictionary.com
1630s, verbal noun from present participle of block (v.). By 1891 in U.S. football; by 1961 in theater.
blocks (n.) Look up blocks at Dictionary.com
children's wooden building toys, 1821, from block (n.).
blocky (adj.) Look up blocky at Dictionary.com
1879, from block (n.) + -y (2). Related: Blockily; blockiness.
blog (n.) Look up blog at Dictionary.com
1998, short for weblog (which is attested from 1994, though not in the sense "online journal"), from (World Wide) Web + log. Joe Bloggs (c. 1969) was British slang for "any hypothetical person" (compare U.S. equivalent Joe Blow); earlier blog meant "a servant boy" in one of the college houses (c. 1860, see Partridge, who describes this use as a "perversion of bloke"), and, as a verb, "to defeat" in schoolboy slang. The Blogger online publishing service was launched in 1999.
bloke (n.) Look up bloke at Dictionary.com
"fellow," 1851, London slang, of unknown origin, perhaps from Celtic ploc "large, stubborn person;" another suggestion is Romany (Gypsy) and Hindi loke "a man."
blond (n.) Look up blond at Dictionary.com
c. 1755 of a type of lace, 1822 of persons; from blond (adj.).
blond (adj.) Look up blond at Dictionary.com
late 15c., from Old French blont "fair, blond" (12c.), from Medieval Latin blundus "yellow," perhaps from Frankish *blund. If it is a Germanic word, it is possibly related to Old English blonden-feax "gray-haired," from blondan, blandan "to mix" (see blend (v.)). According to Littré, the original sense of the French word was "a colour midway between golden and light chestnut," which might account for the notion of "mixed."

Old English beblonden meant "dyed," so it is also possible that the root meaning of blonde, if it is Germanic, may be "dyed," as ancient Teutonic warriors were noted for dying their hair. Du Cange, however, writes that blundus was a vulgar pronunciation of Latin flavus "yellow." Another guess (discounted by German etymologists), is that it represents a Vulgar Latin *albundus, from alba "white."

The word was reintroduced into English 17c. from French, and was until recently still felt as French, hence blonde (with French feminine ending) for females. Italian biondo, Spanish blondo, Old Provençal blon all are of Germanic origin.
Fair hair was much esteemed by both the Greeks and Romans, and so they not only dyed and gold-dusted theirs ..., but also went so far as to gild the hair of their statues, as notably those of Venus de Medici and Apollo. In the time of Ovid (A.U.C. 711) much fair hair was imported from Germany, by the Romans, as it was considered quite the fashionable color. Those Roman ladies who did not choose to wear wigs of this hue, were accustomed to powder theirs freely with gold dust, so as to give it the fashionable yellow tint. [C. Henry Leonard, "The Hair," 1879]
blonde Look up blonde at Dictionary.com
late 15c.; see blond (adj.).
blondish (adj.) Look up blondish at Dictionary.com
1857, from blond (adj.) + -ish.
blondness (n.) Look up blondness at Dictionary.com
1842, from blond (adj.) + -ness.
blood (v.) Look up blood at Dictionary.com
1590s, "to smeart with blood;" 1620s, "to cause to bleed," from blood (n.). Meaning "to give an animal its first taste of blood" is from 1781. Related: Blooded; blooding.
blood (n.) Look up blood at Dictionary.com
Old English blod "blood," from Proto-Germanic *blodam "blood" (source also of Old Frisian blod, Old Saxon blôd, Old Norse bloð, Middle Dutch bloet, Dutch bloed, Old High German bluot, German Blut, Gothic bloþ), from PIE *bhlo-to-, perhaps meaning "to swell, gush, spurt," or "that which bursts out" (compare Gothic bloþ "blood," bloma "flower"), in which case it would be from suffixed form of *bhle-, extended form of root *bhel- (3) "to thrive, bloom" (see folio).

There seems to have been an avoidance in Germanic, perhaps from taboo, of other PIE words for "blood," such as *esen- (source of poetic Greek ear, Old Latin aser, Sanskrit asrk, Hittite eshar); also *krew-, which seems to have had a sense of "blood outside the body, gore from a wound" (source of Latin cruour "blood from a wound," Greek kreas "meat"), which came to mean simply "blood" in the Balto-Slavic group and some other languages.

Inheritance and relationship senses (also found in Latin sanguis, Greek haima) emerged in English by mid-13c. Meaning "person of one's family, race, kindred" is late 14c. As the seat of passions, it is recorded from c. 1300. Slang meaning "hot spark, a man of fire" [Johnson] is from 1560s. Blood pressure attested from 1862. Blood money is from 1530s; originally money paid for causing the death of another.

Blood type is from 1928. That there were different types of human blood was discovered c. 1900 during early experiments in transfusion. To get blood from a stone "do the impossible" is from 1660s. Expression blood is thicker than water attested by 1803, in reference to family ties of those separated by distance. New (or fresh) blood, in reference to members of an organization or group is from 1880.
blood-curdling (adj.) Look up blood-curdling at Dictionary.com
also bloodcurdling, 1817, from blood (n.) + present participle of curdle. Also formerly with a noun form, bloodcurdler "incident which freezes the blood," especially "sensational story," 1877, slang; also in use in this sense was blood-freezer (1886).
blood-letting (n.) Look up blood-letting at Dictionary.com
also bloodletting, early 13c., blod letunge, from blood (n.) + letting. Hyphenated from 17c., one word from mid-19c. Old English had blodlæte "blood-letting."
blood-red (adj.) Look up blood-red at Dictionary.com
Old English blodread; see blood (n.) + red (adj.1).
blood-stained (adj.) Look up blood-stained at Dictionary.com
1590s, from blood (n.) + past participle of stain (v.).
bloodhound (n.) Look up bloodhound at Dictionary.com
also blood-hound, type of large dog used in hunting, c. 1300, from blood (n.) + hound (n.).
bloodily (adv.) Look up bloodily at Dictionary.com
1560s, from bloody + -ly (2).
bloodiness (n.) Look up bloodiness at Dictionary.com
1590s, from bloody (adj.) + -ness.
bloodless (adj.) Look up bloodless at Dictionary.com
Old English blodleas; see blood (n.) + -less. The figurative sense in Middle English was "powerless." Related: Bloodlessly.
bloodlust (n.) Look up bloodlust at Dictionary.com
1847 (Bulwer Lytton), also blood-lust, from blood (n.) + lust (n.).
bloodshed (n.) Look up bloodshed at Dictionary.com
also blood-shed, c. 1500, "the shedding of (one's) blood," from verbal phrase (attested in late Old English), from blood (n.) + shed (v.). The sense of "slaughter" is much older (early 13c., implied in bloodshedding).
bloodshot (adj.) Look up bloodshot at Dictionary.com
also blood-shot, 1550s, short for bloodshotten (c. 1500), from blood (n.) + old past participle of shoot.
bloodstream (n.) Look up bloodstream at Dictionary.com
also blood-stream, 1847, from blood (n.) + stream (n.).
bloodsucker (n.) Look up bloodsucker at Dictionary.com
also blood-sucker, late 14c., of animals, from blood (n.) + sucker (n.); in the figurative sense, of persons, it is attested from 1660s.