What does "amino acid" mean?

Any organic compound containing both an amino and a carboxylic acid functional group.

What is a synonym for "amino acid"?

Common synonyms include: acid, alanine, albuminoid, aminoalkanoic acid, arginine, chromoprotein.

Pronounced //əˈminoʊ ˈæsɪd//.

/əˈminoʊ ˈæsɪd/ noun

noun ·Rare ·Advanced level

Noun

1
Any organic compound containing both an amino and a carboxylic acid functional group.
2
organic compounds containing an amino group and a carboxylic acid group wordnet
3
Any of the twenty naturally occurring α-amino acids (having the amino, and carboxylic acid groups on the same carbon atom), and a variety of side chains, that combine, via peptide bonds, to form proteins.

See amine and acid. Likely a calque of German Aminosäure, which is attested earlier.