Source : Webster's Revised Unabridged Dictionary (1913)

Formicary \For"mi*ca*ry\, n. [LL. formicarium, fr. L. formica an
   ant.] (Zo["o]l.)
   The nest or dwelling of a swarm of ants; an ant-hill.

Source : WordNet®

formicary
     n : a mound of earth made by ants as they dig their nest [syn: {anthill}]