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English word antihistamine comes from English anti-, English histamine
anti- (English)
(immunology) That reacts with immunoglobins found in the specified animal.. Against, hostile to.. Contrasting with the norm.. Counteracting, neutralizing.. Opposite of, reverse.. Physically opposite: applied to mountain ranges.. Related to antiparticles.
histamine (English)
(neurotransmitter) An amine, C5H9N3, formed by decarboxylation of histidine, that causes dilatation of capillaries, contraction of smooth muscle, and stimulation of gastric acid secretion; it is released during allergic reactions.
antihistamine (English)
(pharmaceutical drug) A drug or substance that counteracts the effects of a histamine. Commonly used to alleviate the symptoms of hay fever and other allergies.