Word | Noun | Adjective | Verb | Adverb |
---|---|---|---|---|
essential amino acid | Yes | No | No | No |
tryptophan | Yes | No | No | No |
essential amino acid (noun) | tryptophan (noun) |
---|---|
an amino acid that is required by animals but that they cannot synthesize; must be supplied in the diet | an amino acid that occurs in proteins; is essential for growth and normal metabolism; a precursor of niacin |