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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Nearby words

book bag, book burning, book club, book clubs, book end, book gill, book group, book in, book into, book jacket, book learning

Origin of book gill

First recorded in 1895–1900

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019