English word antihistamine comes from English anti-, English histamine
| Dictionary entry | Language | Definition |
|---|---|---|
| anti- | English (en) | (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 (en) | (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 (en) | (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. |