Great saphenous vein

The great saphenous vein (GSV), previously also called the long saphenous vein, is a large, subcutaneous, superficial vein of the leg. It is the longest vein in the body running along the length of the lower limb.

The terms "saphaina" (Greek, meaning "manifest," "to be clearly seen") and "safoon" (Hebrew, "שָׂפוּן" meaning "hidden/covered") as well as "safin" (Arabic, "سافن" meaning "deep/embedded") have been claimed as the origin for the word "saphenous."