Merriam-Webster Collegiate Dictionary - elephantiasis

 noun  (plural elephantiases)  Etymology: New Latin, from Latin, a kind of leprosy, from Greek, from elephant-, elephas  Date: 1562  1. enlargement and thickening of tissues; specifically the enormous enlargement of a limb or the scrotum caused by obstruction of lymphatics by filarial worms (especially Wuchereria bancrofti)  2. an undesirable usually enormous growth, enlargement, or overdevelopment ~ of the imagination