Word Study
amino acid
OXFORD DICTIONARY
amino acid, n. Biochem. any of a group of organic compounds containing both the carboxyl (COOH) and amino (NH2) group, occurring naturally in plant and animal tissues and forming the basic constituents of proteins.
Etymology
AMINE + ACID
THESAURUS
amino acid
alanine, albuminoid, arginine, chromoprotein, dipeptide, glycine, glycoprotein, leucine, lipoprotein, lysine, methionine, nucleoprotein, peptide, phenylalanine, phosphoprotein, proteid, protein, protide, sarcosine, serine, threonine, valineFor further exploring for "amino acid" in Webster Dictionary Online