pen shell

noun

Definition of pen shell

: a bivalve mollusk of the family Pinnidae having the shell resembling a quill pen in outline — compare pinna

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Cite this Entry

“Pen shell.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/pen%20shell. Accessed 18 Sep. 2020.

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