ORNITHINE Scrabble 12 Words With Friends 13 Scrabble letter values: O1R1N1I1T1H4I1N1E1 = 12 Definition noun an amino acid that does not occur in proteins but is important in the formation of urea. See all 156 words you can make from ORNITHINE → 9-letter words Words starting with O Words ending with E ← Unscramble different letters