Etymology
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Words related to blood

*bhel- (3)
Proto-Indo-European root meaning "to thrive, bloom," possibly a variant of PIE root *bhel- (2) "to blow, swell."

It forms all or part of: blade; bleed; bless; blood; blow (v.2) "to bloom, blossom;" bloom (n.1) "blossom of a plant;" bloom (n.2) "rough mass of wrought iron;" blossom; cauliflower; chervil; cinquefoil; deflower; defoliation; effloresce; exfoliate; feuilleton; flora; floral; floret; florid; florin; florist; flour; flourish; flower; foil (n.) "very thin sheet of metal;" foliage; folio; folium; gillyflower; Phyllis; phyllo-; portfolio; trefoil.

It is the hypothetical source of/evidence for its existence is provided by: Greek phyllon "leaf;" Latin flos "flower," folio, folium "leaf;" Middle Irish blath, Welsh blawd "blossom, flower;" Gaelic bile "leaflet, blossom;" Old English blowan "to flower, bloom."
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bless (v.)
Origin and meaning of bless
Old English bletsian, bledsian, Northumbrian bloedsian "to consecrate by a religious rite, make holy, give thanks," from Proto-Germanic *blodison "hallow with blood, mark with blood," from *blotham "blood" (see blood (n.)). Originally a blood sprinkling on pagan altars.

This word was chosen in Old English bibles to translate Latin benedicere and Greek eulogein, both of which have a ground sense of "to speak well of, to praise," but were used in Scripture to translate Hebrew brk "to bend (the knee), worship, praise, invoke blessings." L.R. Palmer ("The Latin Language") writes, "There is nothing surprising in the semantic development of a word denoting originally a special ritual act into the more generalized meanings to 'sacrifice,' 'worship,' 'bless,' " and he compares Latin immolare (see immolate).

The meaning shifted in late Old English toward "pronounce or make happy, prosperous, or fortunate" by resemblance to unrelated bliss. Meaning "invoke or pronounce God's blessing upon" is from early 14c. No cognates in other languages. Related: Blessed; blessing.
blood-bank (n.)
1938, from blood (n.) + bank (n.1).
blood-curdling (adj.)
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).
bloodhound (n.)
also blood-hound, type of large dog used in hunting, c. 1300, from blood (n.) + hound (n.). It traces wounded prey by the scent of the blood it has spilled, or any other trace. Similar formation in Dutch bloedhond, German Bluthund.
bloodless (adj.)
Old English blodleas, "drained of blood;" see blood (n.) + -less. The figurative sense in Middle English was "powerless, without spirit or energy." Meaning "free from bloodshed" is from c. 1600; that of "cold-hearted" is from 1881. Related: Bloodlessly.
blood-letting (n.)
also bloodletting, early 13c., blod letunge, from blood (n.) + letting. Hyphenated from 17c., one word from mid-19c. Old English had blodlæte "blood-letting," from blodlætan "to bleed, let blood."
blood-lust (n.)
also bloodlust, "eagerness to shed blood," 1847 (Bulwer Lytton), from blood (n.) + lust (n.).
blood-red (adj.)
"blood-colored," Old English blodread; see blood (n.) + red (adj.1). Compare Dutch bloedrood, German blutroth, Old Norse bloðrauðr.
blood-root (n.)
1570s as the name of a European plant with red-colored roots; later transferred to an early-flowering North American herb with the same property, from blood (n.) + root (n.).