/ Dictionary / Index E eusocial: Meaning and Definition of Find definitions for: eu•so•cial Pronunciation: (y-sō'shul), [key] — adj. Animal Behav. 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. Euskera eusol Related Content Daily Word Quiz: eccentric Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language