boat shell
Webster's Dictionary (1913)
Boat′ shell′ (…).
Zoology (a) A marine gastropod of the genus Crepidula. The species are numerous. It is so named from its form and interior deck. (b) A marine univalve shell of the genus Cymba.
Webster’s Revised Unabridged Dictionary (1913), from GCIDE 0.54
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perniciousadjective
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