Etymology
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hurricane (n.)

sea-storm of severest intensity, 1550s, a partially deformed adoption of Spanish huracan (Gonzalo Fernandez de Oviedo y Valdés, "Historia General y Natural de las Indias," 1547-9), furacan (in the works of Pedro Mártir De Anghiera, chaplain to the court of King Ferdinand and Queen Isabella and historian of Spanish explorations), from an Arawakan (West Indies) word. In Portuguese, it became furacão. For confusion of initial -f- and -h- in Spanish, see hacienda. The word is first in English in Richard Eden's "Decades of the New World":

These tempestes of the ayer (which the Grecians caule Tiphones ...) they caule furacanes.

OED records 39 different spellings, mostly from the late 16c., including forcane, herrycano, harrycain, hurlecane. The modern form became frequent from 1650 and was established after 1688. Shakespeare uses hurricano ("King Lear," "Troilus and Cressida"), but in reference to waterspouts.

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imbecile (adj.)

1540s, imbecille "weak, feeble" (especially in reference to the body), from French imbecile "weak, feeble" (15c.), from Latin imbecillus "weak, feeble," a word of uncertain origin.

The Latin word traditionally is said to mean "unsupported" or "without a walking stick" (Juvenal: imbecillis: quasi sine baculo), from assimilated form of in- "not, opposite of" + baculum "a stick" (see bacillus), but Century Dictionary finds that "improbable" and de Vaan finds it "very far-fetched" and adds "it seems to me that exactly the persons who can walk without a support are the stronger ones." There also are phonological objections.

Sense shifted to "mentally weak or incapable" from mid-18c. (compare frail, which in provincial English also could mean "mentally weak"). As a noun, "feeble-minded person," it is attested from 1802. Traditionally an adult with a mental age of roughly 6 to 9 (above an idiot but beneath a moron).

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climacteric (n.)

1620s, "a critical stage in human life, a period supposed to be especially liable to remarkable change with regard to health, life or fortune," from Latin climactericus, from Greek klimakterikos "of a critical period," from klimakter "rung of a ladder" (see climax (n.)).

By some, held to be the years that are multiples of 7 (14, 21, 28, etc.), by others only the 3rd, 5th, 7th, and ninth periods of 7 years (21, 35, 49, etc.), to which some added the 81st year. By still others it was regarded as the years that were multiples of 9. The greator grand climacteric,supposed to be especially remarkable, was the 63rd year (7x9) or the 81st (9x9).

In 19c. medicine it often especially meant "menopause." Climacteric was used earlier in English as an adjective, "pertaining to a critical period or crisis" (c. 1600; climacterical in this sense is from 1580s).  

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puss (n.1)

"cat," 1520s, but probably much older than the record, perhaps imitative of the hissing sound commonly used to get a cat's attention or the noise made by the cat in hissing. The same or similar sound is a conventional name for a cat in Germanic languages and as far off as Afghanistan; it is the root of the principal word for "cat" in Rumanian (pisica) and secondary words in Lithuanian (puž, word used for calling a cat), Low German (puus), Swedish dialect katte-pus, Irish puisin "a kitten," etc.

Applied to a girl or woman from c. 1600, originally in a negative sense, implying unpleasant cat-like qualities, but by mid-19c. in affectionate use.

The little puss seems already to have airs enough to make a husband as miserable as it's a law of nature for a quiet man to be when he marries a beauty. ["George Eliot," "Adam Bede," 1859]

Children's game puss-in-the-corner is attested by that name by 17-9.

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rinky-dink (adj.)

"trivial, old-fashioned, worthless," 1913 (from 1912 as a noun, "antiquated or worthless object"), said to be carnival slang and imitative of the sound of banjo music at parades [Barnhart]; compare ricky-tick "old-fashioned jazz" (1938). But early records suggest otherwise unless there are two words. The earliest senses seem to be as a noun, "maltreatment," especially robbery:

So I felt and saw that I was robbed and I went to look after an officer. I found an officer on the corner of Twenty-fifth street and Sixth avenue. I said, "Officer, I have got the rinky-dink." He knew what it meant all right. He said, "Where? Down at that wench house?" I said, "I guess that is right." [testimony dated New York August 9, 1899, published 1900]

And this chorus from the "Yale Literary Magazine," Feb. 1896:

Rinky dinky, rinky dink,
Stand him up for another drink.
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plank (n.)

late 13c. (c. 1200 as a surname), "thick board used in construction," from Old North French planke, a variant of Old French planche "plank, slab, little wooden bridge" (12c.), from Late Latin planca "broad slab, board," probably from Latin plancus "flat, flat-footed," from a nasalized variant of PIE root *plak- (1) "to be flat." Planche itself was also used in Middle English.

Technically, timber sawed to measure 2 to 6 inches thick, 9 inches or more wide, and 8 feet or more long. The political sense of "article or paragraph formulating a distinct principle in a party platform" is U.S. coinage from 1848, based on the double sense of platform. To be made to walk the plank, "be forced to walk along a plank laid across the bulwarks of a ship until one reaches the end and falls into the sea," popularly supposed to have been a pirate form of execution, is attested from 1789, and most early references are to slave-ships disposing of excess human cargo in crossing the ocean.

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five (adj., n.)

"1 more than four; the number which is one more than four; a symbol representing this number;" Old English fif "five," from Proto-Germanic *fimfe (source also of Old Frisian fif, Old Saxon fif, Dutch vijf, Old Norse fimm, Old High German funf, Gothic fimf), from PIE root *penkwe- "five." The lost *-m- is a regular development (compare tooth).

Five-and-ten (Cent Store) is from 1880, American English, with reference to prices of goods for sale. Five-star (adj.) is from 1913 of hotels, 1945 of generals. Slang five-finger discount "theft" is from 1966. The original five-year plan was 1928 in the U.S.S.R. Five o'clock shadow attested by 1937.

[under picture of a pretty girl] "If I were a man I'd pay attention to that phrase '5 O'Clock Shadow.' It's that messy beard growth which appears prematurely about 5 P.M." [advertisement for Gem razors and blades in Life magazine, May 9, 1938]
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Arcturus 

late 14c., orange bright star in the constellation Bootes (also used of the whole constellation), from Latin Arcturus, from Greek Arktouros, literally "guardian of the bear" (the bright star was anciently associated with nearby Ursa Major, the "Big Dipper," which it seems to follow across the sky). For first element see arctic; second element is Greek ouros "watcher, guardian, ward," from PIE root *wer- (3) "perceive, watch out for." It is fourth-brightest of the fixed stars. The double nature of the great bear/wagon (see Big Dipper) has given two different names to the constellation that follows it: Arktouros "bear-ward" and Bootes "the wagoner" (from Greek, ultimately from PIE root *gwou- "ox, bull, cow").

Arcturus in the Bible (Job ix.9 and xxxviii.32) is a mistranslation by Jerome (continued in KJV) of Hebrew 'Ayish, which refers to what we see as the "bowl" of the Big Dipper. In Israel and Arabia, the seven stars of the Great Bear seem to have been a bier (the "bowl") followed by three mourners. In the Septuagint it was translated as Pleiada, which is equally incorrect.

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jubilee (n.)

late 14c., in the Old Testament sense, from Old French jubileu "jubilee; anniversary; rejoicing" (14c., Modern French jubilé), from Late Latin iubilaeus "the jubilee year," originally an adjective, "of the jubilee," from Greek iabelaios, from iobelos, from Hebrew yobhel "jubilee," formerly "a trumpet, ram's horn," literally "ram." The original jubilee was a year of emancipation of slaves and restoration of lands, to be celebrated every 50th year (Levit. xxv:9); it was proclaimed by the sounding of a ram's horn on the Day of Atonement.

The form of the word was altered in Latin by association with unrelated Latin iubilare "to shout with joy" (for which see jubilant), and the confusion of senses has continued in the Romanic languages and English. The general sense of "season of rejoicing" is first recorded mid-15c. in English, however through early 20c. the word kept its specific association with 50th anniversaries.

As a type of African-American folk song, it is attested from 1872. The Catholic Church sense of "a period for remission of sin penalties in exchange for pilgrimages, alms, etc." was begun in 1300 by Boniface VIII.

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knothead (n.)
"stupid person," by 1899, American English, from knot (n.) + head (n.). Joe Knothead is the name of a character in an 1857 blackface satire publication. And a local history from Massachusetts published in 1879 describes an old-time character known as knot-head because "[d]uring the hottest days of summer ... he worked bare-headed in the sun ...."

Knothead also was used as a term in cattle and sheep raising, defined in 1922 as "a type of poorly bred, stunted northern cattle, about the size of yearlings, but with heavy horns indicating that they are older." It turns up, however, in an 1849 petition to the Ohio Legislature, recommending a certain person for a court position, in part because he is a knot-head, which the report of the petition notes is a term of praise for a judge because they are asked to untangle knotty legal questions, but which phrase, it adds, "is believed not to be in use among gentlemen in the north part of the State." [Appendix to the Journal of the Ohio House of Representatives, Session of 1848-9]
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