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1. Denoting mutual opposition in action between structures, agents, diseases, or physiologic processes. Cf. synergism. 2. The situation in which the combined effect of two or more factors is smaller than the solitary effect of any one of the factors.mutual resistance; [G. antagonisma, from anti, against, + agonizomai, to fight, fr. agon, a contest]
bacterial a. the inhibition of one bacterium by products of another.
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