al·le·lop·a·thy

[uh-lee-lop-uh-thee, al-uh-lop-]
noun Botany.
suppression of growth of a plant by a toxin released from a nearby plant of the same or another species.

Origin:
1940–45; < French allélopathie; see allele, -pathy

al·le·lo·path·ic [uh-lee-luh-path-ik, uh-lel-uh-] , adjective
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
allelopathy (ˌælɪˈlɒpəθɪ) [Click for IPA pronunciation guide]
 
n
the inhibitory effect of one living plant upon another by the release of toxic substances
 
[from French allélopathie, from Greek allēl- one another + pathos suffering]

Collins English Dictionary - Complete & Unabridged 10th Edition
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00:10
Allelopathy is always a great word to know.
So is slumgullion. Does it mean:
a stew of meat, vegetables, potatoes, etc.
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
American Heritage
Science Dictionary
allelopathy   (ə-lē-lŏp'ə-thē, āl'ə-)  Pronunciation Key 
The inhibition of growth in one plant species by chemicals produced by another. For example, other plants will often not grow underneath black walnut trees, since these trees produce juglone, a chemical inhibiting plant respiration.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Allelopathy is the secretion by plants of chemicals that inhibit the growth or reproduction of competing plant species.
The study of allelopathy as a discipline has a long and varied history.
Allelopathy and exotic plant invasion: from molecules and genes to species interactions.
Determine how variation in allelopathy affects population growth and demography.
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