Etymology
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vein (n.)
c. 1300, from Old French veine "vein, artery, pulse" (12c.), from Latin vena "a blood vessel," also "a water course, a vein of metal, a person's natural ability or interest," of unknown origin. The mining sense is attested in English from late 14c. (Greek phleps "vein" had the same secondary sense). Figurative sense of "strain or intermixture" (of some quality) is recorded from 1560s; that of "a humor or mood, natural tendency" is first recorded 1570s.
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vortex (n.)
1650s, "whirlpool, eddying mass," from Latin vortex, variant of vertex "an eddy of water, wind, or flame; whirlpool; whirlwind," from stem of vertere "to turn" (from PIE root *wer- (2) "to turn, bend"). Plural form is vortices. Became prominent in 17c. theories of astrophysics (by Descartes, etc.). In reference to human affairs, it is attested from 1761. Vorticism as a movement in British arts and literature is attested from 1914, coined by Ezra Pound. Related: Vortical; vorticist.
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venule (n.)
"small vein," 1850, from Latin venula, diminutive of vena "vein" (see vein).
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intravenous (adj.)
"in or occurring within a vein," 1847, from intra- "within, inside" + Latin venous, from vena "vein" (see vein). Related: Intravenously.
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phlebitis (n.)

"inflammation of a vein," 1820, medical Latin, from phlebo- "vein" + -itis "inflammation."

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phlebo- 

word-forming element in medicine meaning "a vein or veins," from Greek phlebo-, combining form of phleps "vein," a word of uncertain origin.

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venation (n.)
"arrangement of veins," 1640s, of plant structures, noun of state from Latin vena "vein" (see vein). Related: Venational.
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vena cava (n.)
Medical Latin, from Latin vena "vein" (see vein) + cava, from cavus "hollow" (from PIE root *keue- "to swell," also "vault, hole").
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varices (n.)
plural of varix "dilated vein" (c. 1400), from Latin varix "a varicose vein," which de Vaan derives from varus "bent outward, bow-legged," which is of uncertain origin (see vary).
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venous (adj.)
1620s, from Latin venosus "full of veins," from vena (see vein).
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