I. cyst·a·thionine ˌsistə+ noun
( -s )
Etymology: cyst eine + -a- + me thionine
: a diamino dicarboxylic acid C 7 H 14 N 2 O 4 S held to be formed as an intermediate in the conversion of methionine to cysteine in the animal organism
II. cys·ta·thi·o·nine ˌsistəˈthīəˌnēn, -_nə̇n noun
( -s )
Etymology: cyst eine + connective -a- + me thionine
: a sulfur-containing amino acid C 7 H 14 N 2 O 4 S formed as an intermediate in the conversion of methionine to cysteine in animals