- A vascular pigmented membrane projecting into the vitreous
humor within the globe of the eye in birds, and in many reptiles and
fishes; -- also called marsupium. - The pubic bone. - Any species of bivalve mollusks of the genus Pecten, and
numerous allied genera (family Pectinidae); a scallop. See Scallop. - The comb of a scorpion. See Comb, 4 (b).