From the Latin word for "ant", it's an anthill or nest
(nthl) n. a mound of earth formed by a colony of ants in digging... [DOC] [TLE] Ant - definition of ant by The Free Dictionary [PAR] Latin -ant-, present participle s. of verbs in -re; in many words < French -ant < 
Latin -ant-] ... carpenter ant - ant that nests in decaying wood in which it bores 
tunnels for ... ant - reddish-brown European ant typically living in anthills in 
woodlands .... meets a plodding ant when the earth has broken away on its 
homeward path.