antagonism

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an·tag·o·nism

(an-tag'ŏ-nizm),
1. Denoting mutual opposition in action among structures, agents, diseases, or physiologic processes. Compare: synergism.
2. A situation in which the combined effect of two or more factors is smaller than the solitary effect of any one of the factors.
Synonym(s): mutual resistance
[G. antagōnisma, from anti, against, + agōnizomai, to fight, fr. agōn, a contest]

antagonism

(ăn-tăg′ə-nĭz′əm)
n.
Biochemistry Interference in the physiological action of a chemical substance by another having a similar structure.

antagonism

An interaction between chemicals or therapeutic agents, in which one substance partially or completely inhibits or counteracts the effect of the other.

an·tag·o·nism

(an-tag'ŏ-nizm)
1. Denoting mutual opposition in action between structures, agents, diseases, or physiologic processes.
Compare: 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.
Synonym(s): mutual resistance.
[G. antagōnisma, from anti, against, + agōnizomai, to fight, fr. agōn, a contest]

antagonism

  1. the inhibiting or nullifying action of one substance or organism on another, e.g. the antibiotic effect of penicillin, or the exhaustion of a food supply by one organism at the expense of another.
  2. the normal opposition between certain muscles (see ANTAGONISTIC MUSCLE).