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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.
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.