WordReference Random House Unabridged Dictionary of American English © 2017
a•men•sa•lism  (ā mensə liz′əm),USA pronunciation n. [Ecol.]
  1. Ecologya relationship between two species of organisms in which the individuals of one species adversely affect those of the other and are unaffected themselves.
  • probably a-6 + (com)mensal + -ism

'amensalism' also found in these entries:

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