From Longman Dictionary of Contemporary Englishamino acida‧mi‧no ac‧id /əˌmiːnəʊ ˈæsəd, əˌmaɪ- $ -noʊ-/ noun [countable] HBone of the substances that combine to form proteins
Examples from the Corpus
amino acid• Tryptophan is a naturally occurring amino acid.Origin amino acid (1800-1900) amine type of chemical compound ((19-21 centuries)), from ammonia 