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neurotransmitter

(no̵or′ō transmit′ər, nyo̵or′-; -tranz-)

noun

a biochemical substance, as acetylcholine or norepinephrine, that transmits or inhibits nerve impulses at a synapse

See neurotransmitter in American Heritage Dictionary 4

noun
A chemical substance, such as acetylcholine or dopamine, that transmits nerve impulses across a synapse.

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