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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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Definitions of venation from WordNet

venation (n.)
(botany) the arrangement of veins in a leaf;
venation (n.)
(zoology) the system of venous blood vessels in an animal;
Synonyms: venous blood system
From wordnet.princeton.edu