Etymology
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portal (n.)

late 14c., "gate, gateway," especially "the entire architectural treatment of the entrance and its surroundings of a cathedral or other grand building," from Old French portal "gate" (Modern French portail) and directly from Medieval Latin portale "city gate, porch," from neuter of portalis (adj.) "of a gate," from Latin porta "gate," from PIE *prta-, suffixed form of PIE root *per- (2) "to lead, pass over." The medical sense of "place where a drug, etc., enters or leaves the system" is by 1910.

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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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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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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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venous (adj.)
1620s, from Latin venosus "full of veins," from vena (see vein).
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