Etymology
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temporal (adj.)
late 14c., "worldly, secular;" also "terrestrial, earthly; temporary, lasting only for a time," from Old French temporal "earthly," and directly from Latin temporalis "of time, denoting time; but for a time, temporary," from tempus (genitive temporis) "time, season, moment, proper time or season," from Proto-Italic *tempos- "stretch, measure," which according to de Vaan is from PIE *temp-os "stretched," from root *ten- "to stretch," the notion being "stretch of time." Related: Temporally.
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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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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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temporality (n.)
late 14c., "temporal power," from Late Latin temporalitas, from temporalis "of a time, but for a time" (see temporal).
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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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