book gill

noun

A gill found in horseshoe crabs consisting of membranous folds, resembling the leaves of a book.

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Meanings

nounbook gill (plural book gills)

plural book gills

  1. biologyA gill found in horseshoe crabs consisting of membranous folds, resembling the leaves of a book.
Cite this entry
APA

book gill. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/book%20gill

MLA

“book gill.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/book%20gill. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “book gill,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/book%20gill.

Source: book gill on Wiktionary, CC BY-SA 4.0.