ˈastəsə̇n noun
also as·ta·cene -ˌsēn
( -s )
Etymology: International Scientific Vocabulary astac- (from New Latin Astacus ) + -in or -ene
: a red carotenoid ketone pigment C 40 H 48 O 4 found especially in crustaceans (as in boiled lobster shell) and obtained by oxidation of astaxanthin