γ–aminobutyric acid\ˌgam-ə-ə-ˌmē-(ˌ)nō-byü-ˌtir-ik-, ˌgam-ə-ˌam-ə-(ˌ)nō-\play
Medical Definition of gamma–aminobutyric acid
: an amino acid C4H9NO2 that is a neurotransmitter that induces inhibition of postsynaptic neurons—called also GABA
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