book gill
noun
the gill of a horseshoe crab, composed of numerous membranous structures arranged like the leaves of a closed book.
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Origin of book gill
First recorded in 1895–1900
Words nearby book gill
book, book bag, book burning, book club, book end, book gill, book group, book in, book into, book jacket, book learning
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020