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amensalism

[ey-men-suh-liz-uh m] /eɪˈmɛn səˌlɪz əm/
noun, Ecology
1.
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
probably a-6 + (com)mensal + -ism
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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amensalism in Science
amensalism
  (ā-měn'sə-lĭz'əm)   
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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Encyclopedia Article for amensalism

association between organisms of two different species in which one is inhibited or destroyed and the other is unaffected. There are two basic modes: competition (q.v.), in which a larger or stronger organism excludes a smaller or weaker one from living space or deprives it of food, and antibiosis, in which one organism is unaffected but the other is damaged or killed by a chemical secretion.

Learn more about amensalism with a free trial on Britannica.com
Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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