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book gill

noun
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Definition of book gill

: a gill found in the horseshoe crabs that consists of membranous folds arranged like the leaves of a book

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First Known Use of book gill

1897, in the meaning defined above

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The first known use of book gill was in 1897

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Cite this Entry

“Book gill.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/book%20gill. Accessed 28 Oct. 2020.

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