Fasciolidae

noun plural

Fas·​ci·​ol·​i·​dae ˌfas-ē-ˈäl-ə-dē 

: a cosmopolitan family of digenetic trematodes chiefly infesting the livers of mammals and typically having a flattened leaf-shaped body with the ventral sucker near the anterior end see fasciola, fascioloides, fasciolopsis