/ Dictionary / Index A alanine: Meaning and Definition of Find definitions for: al•a•nine Pronunciation: (al'u-nēn", -nin), [key] — n. Biochem. any of several isomers of a colorless, crystalline, water-soluble amino acid, CHCH(NH)COOH, found in many proteins and produced synthetically: used chiefly in biochemical research. Abbr.: Ala; Symbol: A Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: alanine (Thesaurus) Alani Al-Anon Related Content Daily Word Quiz: pristine Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language