An interaction of two or more chemicals such that the effect, when combined, is less than the predicted effect based on the activity of each chemical applied separately.

the relation between opposing principles or forces or factors; "the inherent antagonism of capitalism and socialism"

the effect of a deficiency or toxicity of an element that restricts or interferes with the uptake of another

The opposite of synergy. One factor (treatment) reduces or cancels the effect of another

The combined action of two or more substances to produce an effect less than the sum of their individual effects; the opposite of synergism.

n. Mutual opposition or resistance of counteracting forces, principles, or persons. Antarctic adj. Pertaining to the south pole or the regions near it.

When the adverse effect or risk from two or more chemicals interacting with each other is less than what it would be if each chemical was acting separately.

action between two or more compounds in which one interferes with the action of the other so that there is less effect from a similar dose than if it were present alone

Interference in or inhibition of the physiological action of a chemical substance by another having a similar structure.

Opposing action of different chemicals such that the action of one is impaired or the total effect is less than that of one component used separately.

Interference or inhibition of the effect of one chemical by the action of another chemical.

In phytopathology, antagonism refers to the suppression or interference with the normal growth of a plant pathogen by another microorganism, such as bacteria or fungi.

In chemistry, antagonism is a phenomenon where two or more agents in combination have an overall effect which is less than the sum of their individual effects. The word is most commonly used in this fashion in biochemistry and toxicology. Interference in the physiological action of a chemical substance by another having a similar structure.