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
bookcraft, bookcrossing, booked up, bookend, Booker Prize, book gill, book group, bookie, book in, booking, booking agent
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020