tropeic
/trəʊˈpiːɪk/ /trəʊˈpeɪɪk/Zoology. Now rare
adjective
Designating longitudinal muscular ridges on the ventral midline of the abdomen in frilled sharks (genus Chlamydoselachus).
Origin
Late 19th century. From ancient Greek τρόπεως, genitive of τρόπις keel + -ic.