| alpha blocker | (n) any of various drugs that block alpha-adrenergic receptors; used in treating benign prostatic hyperplasia; relaxes the muscles of the prostate and bladder, Syn. alpha-adrenergic blocking agent, alpha-adrenergic blocker, alpha-blocker |
| beta blocker | (n) any of various drugs used in treating hypertension or arrhythmia; decreases force and rate of heart contractions by blocking beta-adrenergic receptors of the autonomic nervous system, Syn. beta-adrenergic blocking agent, beta-adrenergic blocker, beta-blocking agent |
| beta blocker eyedrop | (n) a treatment for glaucoma; the eyedrops reduce intraocular pressure by reducing the production of aqueous humor |
| blocker | (n) a football player whose responsibility is to block players attempting to stop an offensive play |
| blocker | (n) a class of drugs that inhibit (block) some biological process, Syn. blocking agent |
| calcium blocker | (n) any of a class of drugs that block the flow of the electrolyte calcium (either in nerve cell conduction or smooth muscle contraction of the heart); has been used in the treatment of angina or arrhythmia or hypertension or migraine, Syn. calcium-channel blocker |
| histamine blocker | (n) 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 |
| sunscreen | (n) a cream spread on the skin; contains a chemical (as PABA) to filter out ultraviolet light and so protect from sunburn, Syn. sunblock, sun blocker |
