wing-shell noun3 •Any of various species of marine bivalve shells formerly belonging to the genus Avicula (no longer accepted), now a synonym of Pteria, with species assigned to several genera, in which the hinge border projects like a wing. •Any marine gastropod shell formerly in the genus Strombus, with species now assigned to several genera, principally in the family Strombidae. •(no longer used) Any pteropod shell. formswing-shells
