Definitions from Wiktionary (Blocker)

▸ noun:  Agent noun of block (“obstruct or prevent”); something that blocks something else.
▸ noun:  (sports) One who blocks or impedes the movement of an opponent.
▸ noun:  (cricket) A defensive or low-scoring batter.
▸ noun:  (computing) One who prevents another user from contacting them electronically.
▸ noun:  (computing) An application that stops / impedes unauthorised access to a programme.
▸ noun:  (computing) A bug or issue that prevents software from being released.
▸ noun:  (marketing) A gatekeeper who refuses the marketer access to the person they wish to contact.
▸ noun:  (biology, medicine) Any of various medications that block (inhibit) the activity of a chemical messenger or its receptors, such as cardiac conduction modifiers (e.g., alpha-blockers), gastric acid inhibitors (H₂ histamine blockers), puberty blockers, and others.
▸ noun:  A close-fitting rectangular glove worn by a goalie in multiple forms of hockey.
▸ noun:  (poker) A blocker bet.
▸ noun:  (card games) A playing card, needed by one player, that is held by another.
▸ noun:  A person who blocks (stretches or moulds) hats.
▸ noun:  (in combination) A resident or member of a particular block.
▸ noun:  Synonym of block ornament (“a cheap piece of meat of poor quality”). [from 1848]
▸ noun:  A surname.

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