(sports) One who blocks or impedes the movement of an opponent. / (computing) One who prevents another user from contacting them electronically.

plural of blocker

A surname.

plural of Blocker

(computing) a piece of software that prevents pop-up advertisements from being displayed

(pharmacology) A blocking agent, one of a class of drugs used to treat hypertension and control the rate at which the heart beats.

plural of beta blocker

plural of alpha-blocker

(pharmacology) A drug which blocks α1-adrenergic receptors in arteries and smooth muscles. Used to treat benign prostatic hyperplasia and prostatitis and other conditions.

(poker slang) A relatively small bet, chiefly on the river, designed to discourage a player yet to act in the betting round from raising.