n. [ See Cyst. ] (Physiol. Chem.) A white crystalline substance, C3H7NSO2, containing sulphur, occuring as a constituent of certain rare urinary calculi, and occasionally found as a sediment in urine. [ 1913 Webster ]
a. (Zool.) Pertaining to the Polycystina. -- n. One of the Polycystina. [ 1913 Webster ]
[ 1913 Webster ]