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The Collaborative International Dictionary
Wing-shell

Wing-shell \Wing"-shell`\, n. (Zo["o]l.)

  1. Any one of various species of marine bivalve shells belonging to the genus Avicula, in which the hinge border projects like a wing.

  2. Any marine gastropod shell of the genus Strombus. See Strombus.

  3. Any pteropod shell.

Wiktionary
wing-shell

n. 1 Any of various species of marine bivalve shells belonging to the genus ''Avicula'', in which the hinge border projects like a wing. 2 Any marine gastropod shell of the genus ''Strombus''. 3 Any pteropod shell.