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filariasis fil·a·ri·a·sis (fĭl'ə-rī'ə-sĭs)
Disease caused by the presence of filariae in the tissues of the body, often resulting in occlusion of the lymphatic channels that can lead to elephantiasis.
a group of infectious disorders caused by threadlike nematodes of the superfamily Filarioidea, that invade the subcutaneous tissues and lymphatics of mammals, producing reactions varying from acute inflammation to chronic scarring. In the form of heartworm, it may be fatal to dogs and other mammals.