Definition of gamma-aminobutyric acid in English:

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gamma-aminobutyric acid

Pronunciation: /ˈɡamə-əˌmēnōbyo͞oˈtirik ˈasid/


An amino acid that acts to inhibit the transmission of nerve impulses in the central nervous system.
  • Chemical formula: H2NCH2CH2CH2COOH.
Example sentences
  • Phytosterols, a volatile oil, and amino acids, including gamma-aminobutyric acid and L-canavanine, have been isolated from the root.
  • Instead, the etiology of the disorder is related to abnormalities of serotonin, norepinephrine, gamma-aminobutyric acid, dopamine, and cholecystokinin.
  • Hypoxia increases central nervous system levels of specific neuroinhibitors such as endogenous opioids, adenosine, and gamma-aminobutyric acid.


Early 20th century: gamma indicating the relative position of amino on the third carbon away from the acid group.

For editors and proofreaders

Syllabification: gam·ma-a·mi·no·bu·tyr·ic ac·id

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