saphenous vein

n.
Either of two main superficial veins of the leg, one larger than the other, that begin at the foot.

[saphenous, pertaining to the saphena, a saphenous vein, from Middle English, from Medieval Latin saphēna, saphenous vein, from Arabic ṣāfin, standing with one leg slightly raised, saphena, participle of ṣafana, to stand with one leg slightly raised.]

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The noun has one meaning:

Meaning #1: either of two chief superficial veins of the leg that drain blood from the foot
  Synonym: vena saphena

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