noun Physiology, Pharmacology.
- any of certain compounds or medicines that neutralize or inhibit the effect of in the body, used chiefly in the treatment of allergic disorders and colds.
- any drug that neutralizes the effects of histamine, used esp in the treatment of allergies
1933, from+ .
- Any of several drugs used to counteract the physiological effects of histamine.
- Any of various drugs that relieve cold or allergy symptoms by blocking the action of histamine.