Definition of top shell
1
: any of various marine snails constituting the family Trochidae and having a spiral and usually regularly conical shell marked by a flat base and rhombic aperture and a multispiral operculum and sometimes used to make pearl buttons
2
: turban shell
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“Top shell.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/top%20shell. Accessed 30 Jun. 2022.
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