| histamine blocker | |
noun | |
| a medicine used to treat the gastric effects of histamine in cases of peptic ulcers and gastritis and gastroesophageal reflux; works by blocking the effects of histamine on the receptor site known as H2 |
| a chattering or flighty, light-headed person. |
| an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle. |