Etymology
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Euclidean (adj.)
1650s, "of or pertaining to Euclid" (Greek Eukleides), c. 300 B.C.E. geometer of Alexandria. Now often used in contrast to alternative models based on rejection of some of his axioms. His name in Greek means "renowned, glorious," from eu "well" (see eu-) + kleos "fame" (see Clio).
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Hooverville 
1933, American English, from U.S. president Herbert C. Hoover (1874-1964), who was in office when the Depression began, + common place-name ending -ville. Earlier his name was the basis of Hooverize "economize on food" (1917) from his role as wartime head of the U.S. Food Administration.
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henchman (n.)

mid-14c., hengestman, later henshman (mid-15c.) "high-ranking servant (usually of gentle birth), attendant upon a king, nobleman, etc.," originally "groom," probably from man (n.) + Old English hengest "horse, stallion, gelding," from Proto-Germanic *hangistas (source also of Old Frisian hengst, Dutch hengest, German Hengst "stallion"), perhaps literally "best at springing," from PIE *kenku- (source also of Greek kekiein "to gush forth;" Lithuanian šokti "to jump, dance;" Breton kazek "a mare," literally "that which belongs to a stallion").

Perhaps modeled on Old Norse compound hesta-maðr "horse-boy, groom." The word became obsolete in England 17c., but it was retained in Scottish as "personal attendant of a Highland chief," in which sense Scott revived it in literary English from 1810. Sense of "obedient or unscrupulous follower" is first recorded 1839, probably somehow a misunderstanding of the word as used by Scott.

This officer is a sort of secretary, and is to be ready, upon all occasions, to venture his life in defence of his master; and at drinking-bouts he stands behind his seat, at his haunch, from whence his title is derived, and watches the conversation, to see if any one offends his patron. [Scott, notes to "Lady of the Lake," 1820; his proposed etymology is not now considered correct]
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Platonist (n.)

"a follower of Plato or an adherent of his philosophy," 1540s, from Plato (Greek Platōn; see Platonic) + -ist.

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whatchamacallit (n.)
1928, compressed form of phrase "what you may call it." What-do-you-call-it is from 1630s. Earliest recorded variant is what-calle-ye-hym, attested from late 15c. What's-his-name for "unspecified person" is attested from 1690s; variant what's-his-face is first recorded 1967.
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hector (v.)
"to bluster, bully, domineer," 1650s, from slang hector (n.) "a blustering, turbulent, pervicacious, noisy fellow" [Johnson], 1650s, from Hector of the "Iliad," in reference to his encouragement of his fellow Trojans to keep up the fight. Earlier in English the name was used generically for "a valiant warrior" (late 14c.). Related: Hectored; hectoring.
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hard-ass (adj.)

"tough, uncompromising," 1961, from hard (adj.) + ass (n.2). Probably originally military. As a noun, "tough, uncompromising person," from 1967. Old Hard Ass is said to have been a nickname of Gen. George A. Custer (1839-1876) among his cavalry troops because of his seeming tirelessness in the saddle.

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apprentice (v.)
"to bind to a master for instruction in his craft," 1630s, from apprentice (n.). Related: Apprenticed; apprenticing.
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railroad (v.)

"to convict quickly and perhaps unjustly," 1873, American English, from railroad (n.) as the then-fastest form of travel.

A person knowing more than might be desirable of the affairs, or perhaps the previous life of some powerful individual, high in authority, might some day ventilate his knowledge, possibly before a court of justice; but if his wisdom is railroaded to State's prison, his evidence becomes harmless. ["Wanderings of a Vagabond," New York, 1873]

Related: Railroaded; railroading. An earlier verb sense was "to have a mania for building railroads" (1847).

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Oglala 

name of the chief branch of the Teton Sioux people, 1837, from Lakhota (Siouan) oglala "he scatters his own."

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