pneumatocyst

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noun

A sac or other structure containing air and used for flotation by a marine organism, chiefly used in reference to those of kelps and siphonophores.

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Meanings

nounpneumatocyst (plural pneumatocysts)

plural pneumatocysts

  1. marine biologyA sac or other structure containing air and used for flotation by a marine organism, chiefly used in reference to those of kelps and siphonophores.

Origin

From pneumato- + cyst.

Full word history & related roots →

Translations

French pneumatocyste, aérocyste
  • pneumatocystesac containing air used for flotation by marine organism
  • aérocystesac containing air used for flotation by marine organism
Cite this entry
APA

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

MLA

“pneumatocyst.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/pneumatocyst. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “pneumatocyst,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/pneumatocyst.

Source: pneumatocyst on Wiktionary, CC BY-SA 4.0.