/ Dictionary / Index C closed ecosystem: Meaning and Definition of Find definitions for: closed' ec'osystem Pronunciation: [key] — Ecol. Ecol. a self-replenishing ecosystem in which life can be maintained without external factors or outside aid. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. closed-door closed-end Related Content Daily Word Quiz: acerbity Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language