/ Dictionary / Index E eco-: Meaning and Definition of Find definitions for: eco- Pronunciation: [key] a combining form representingin the formation of compounds (ecosystem; ecotype); also with the more general sense “environment,” “nature,” “natural habitat” (ecocide; ecolaw; ecopolitics). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. ECM ecocatastrophe Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language