shell sac

noun

The sac in which the shell of a mollusc is secreted during development; (now especially) the fold of mantle in which a cephalopod secretes its pen or gladius.

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Meanings

nounshell sac (plural shell sacs)

plural shell sacs

  1. biologyThe sac in which the shell of a mollusc is secreted during development; (now especially) the fold of mantle in which a cephalopod secretes its pen or gladius.

    Baby cephalopods, even octopuses, all have a shell sac, which is comparable to the mantle folds that baby clams and snails use to make their shells.

    2017, Danna Staaf, Squid Empire, ForeEdge, →ISBN, page 115
Cite this entry
APA

shell sac. (n.d.). In WatkinsX Dictionary. Retrieved November 2, 2026, from https://dictionary.watkinsx.com/word/shell%20sac

MLA

“shell sac.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/shell%20sac. Accessed November 2, 2026.

Chicago

WatkinsX Dictionary, s.v. “shell sac,” accessed November 2, 2026, https://dictionary.watkinsx.com/word/shell%20sac.

Source: shell sac on Wiktionary, CC BY-SA 4.0.