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Webster 1913 Edition

Noun.

(Zool.)

(a)

Any one of various species of marine bivalve shells belonging to the genus

Avicula

, in which the hinge border projects like a wing.

(b)

Any marine gastropod shell of the genus

Strombus

. See

(c)

Any pteropod shell.

Noun.

[wing and shell.] The shell that covers the wing of insects.