essential amino acid essential • essential condition · · · Info · Definitions · Characters · · essential amino acid · · Text Common · · Latin · · Scripts 20 · · Length 8 · · Syllables Definitions · · · (noun) an amino acid that is required by animals but that they cannot synthesize; must be supplied in the diet. Synonyms: essential amino acid. · · Noun Definition 1 Characters · · space U+0020 a latin small letter a U+0061 c latin small letter c U+0063 d latin small letter d U+0064 e latin small letter e U+0065 i latin small letter i U+0069 l latin small letter l U+006C m latin small letter m U+006D n latin small letter n U+006E o latin small letter o U+006F s latin small letter s U+0073 t latin small letter t U+0074