neurotransmitter

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WORDNET DICTIONARY

Noun neurotransmitter has 1 sense

neurotransmitter(n = noun.substance) - a neurochemical that transmits nerve impulses across a synapse;

gamma aminobutyric acid

acetylcholine

is a kind of neurochemical

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OXFORD DICTIONARY

neurotransmitter, n. Biochem. a chemical substance released from a nerve fibre that effects the transfer of an impulse to another nerve or muscle.