Definition of amino acid noun from the Oxford Advanced Learner's Dictionary

 

amino acid

 noun
noun
BrE BrE//əˌmiːnəʊ ˈæsɪd//
 
; NAmE NAmE//əˌmiːnoʊ ˈæsɪd//
 
(chemistry) Cell biology
 
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any of the substances that combine to form the basic structure of proteins Eggs contain essential amino acids which we depend on for good health. See related entries: Cell biology
See the Oxford Advanced American Dictionary entry: amino acid