Definition of saphenous vein

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sa·phe·nous vein    (s-fns) KEY 

NOUN:

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

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ETYMOLOGY:
saphenous, pertaining to the saphena, a saphenous vein, from Middle English, from Medieval Latin saphna, saphenous vein, from Arabic fin, standing with one leg slightly raised, saphena, participle of afana, to stand with one leg slightly raised