/ Dictionary / Index S serine: Meaning and Definition of Find definitions for: ser•ine Pronunciation: (ser'ēn, -in, sēr'-), [key] — n. Biochem. a crystalline amino acid, HOCHCH(NH)COOH, found in many proteins and obtained by the hydrolysis of sericin, the protein constituting silk gum. Abbr.: Ser; Symbol: S Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: serine (Thesaurus) serin seringa Related Content Daily Word Quiz: spectral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language