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Definition of Boat shell
1. Noun. (zoology) A marine gastropod of the genus ''Crepidula''. The species are numerous. It is so named from its form and interior deck. ¹
2. Noun. (zoology) A marine univalve shell of the genus ''Cymba''. ¹
¹ Source: wiktionary.com
Medical Definition of Boat shell
1.