/ Dictionary / Index A amensalism: Meaning and Definition of Find definitions for: a•men•sa•lism Pronunciation: (ā-men'su-liz"um), [key] — n. Ecol. a relationship between two species of organisms in which the individuals of one species adversely affect those of the other and are unaffected themselves. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. a mensa et thoro ament Related Content Daily Word Quiz: arboreal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language