The Collaborative International Dictionary of English v.0.48:
Ant-hill \Ant"-hill\, n. (Zool.) A mound thrown up by ants or by termites in forming their nests. [1913 Webster]WordNet (r) 3.0 (2006):
anthill n 1: a mound of earth made by ants as they dig their nest [syn: anthill, formicary]