[mass noun](Medicine)a condition in which a limb or other part of the body becomes grossly enlarged due to obstruction of the lymphatic vessels, typically by the nematode parasites which cause filariasis (医)象皮病(一种由丝虫引起的寄生虫病)
语源
mid 16th cent.: via Latin from Greek, from elephas, elephant- 'elephant' + -iasis