el·e·phan·ti·a·sis 
(
ĕl
′ə-f
ən-t
īə-s
ĭs)
n.1. Chronic, often extreme enlargement and hardening of cutaneous and subcutaneous tissue, especially of the legs and external genitals, resulting from lymphatic obstruction.
2. A tropical filarial disease that often leads to this condition as a result of infestation of the lymph glands and vessels with filarial worms; lymphatic filariasis.
[Latin elephantiāsis, from Greek : elephās, elephant-, elephant + -iāsis, -iasis.]