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WordReference Random House Unabridged Dictionary of American English © 2024block•er (blok′ər),USA pronunciation n. - a person or thing that blocks.
- Sport[Football.]a player whose assignment or special skill is blocking.
- [Biochem.]a substance that inhibits the physiological action of another substance, as the beta blocker propranolol that interferes with neurotransmitters in the sympathetic nervous system.
- 1200–50; Middle English; see block, -er1
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