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Meaning of eusocial

eu•so•cial

Pronunciation: (y-sō'shul), [key]
— adj. Animal Behav.
  1. of or pertaining to a form of insect society, as that of ants, characterized by specialization of tasks and cooperative care of the young.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.