myrmecophile

from WordNet (r) 3.0 (2006)
myrmecophile
    n 1: an organism such as an insect that habitually shares the
         nest of a species of ant
from The Collaborative International Dictionary of English v.0.48
myrmecophile \myrmecophile\ n. (Biol.)
   An organism such as an insect that habitually shares the nest
   of a species of ant.
   [WordNet 1.5]
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