| Noun | 1. | prazosin - antihypertensive drug (trade name Minipress) alpha blocker, alpha-adrenergic blocker, alpha-adrenergic blocking agent, alpha-blocker - any of various drugs that block alpha-adrenergic receptors; used in treating benign prostatic hyperplasia; relaxes the muscles of the prostate and bladder antihypertensive, antihypertensive drug - a drug that reduces high blood pressure |