Is “Cystine” a Scrabble word?
Yes
CYSTINE
Valid in at least one Scrabble dictionary
Valid in these dictionaries
SOWPODS / CSW
Scrabble UK & International
TWL / NWL
Scrabble North America
Large English Dictionary
General English word list
Meaning of Cystine
noun
1.A nonessential amino acid formed by the oxidation of cysteine; it contains two cysteine residues linked by a disulfide bond.
Synonyms: E921, improving agent