Pen Shell Definition
noun
Any of several large marine bivalve mollusks of the family Pinnidae, having a thin wedge-shaped or fan-shaped shell.
American Heritage
Other Word Forms of Pen Shell
Noun
Singular:
pen shell
Plural:
pen shellsOrigin of Pen Shell
From the resemblance of their shells to quill pens
From American Heritage Dictionary of the English Language, 5th Edition
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