Medical Definition of saphenous vein
: either of two chief superficial veins of the leg:a: one originating in the foot and passing up the medial side of the leg and through the saphenous opening to join the femoral vein—called also great saphenous vein, long saphenous veinb: one originating similarly and passing up the back of the leg to join the popliteal vein at the knee—called also short saphenous vein, small saphenous vein
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