SINCE 1828
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button shell

noun
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Definition of button shell

: any of several somewhat flattened gastropod mollusks: such as
a : a large Australian top shell (Trochus niloticus)
b : the marine pulmonate snail (Gadinia reticulata) of the California coast that resembles a limpet

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“Button shell.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/button%20shell. Accessed 19 Oct. 2021.

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