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[ey-men-suh-liz-uh m] /eɪˈmɛn səˌlɪz əm/
noun, Ecology
a relationship between two species of organisms in which the individuals of one species adversely affect those of the other and are unaffected themselves.
Origin of amensalism
probably a-6 + (com)mensal + -ism Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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amensalism in Science
A symbiotic relationship in which one organism is harmed or inhibited and the other is unaffected. Examples of amensalism include the shading out of one plant by a taller and wider one and the inhibition of one plant by the secretions of another (known as allelopathy). Compare commensalism, mutualism, parasitism.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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