Phragmocone

noun

noun ·Rare ·Advanced level

Definitions

Noun
  1. 1
    The chambered portion of the shell of certain cephalopods, divided by septa into camerae.

    "This ability to continuously add new buoyancy chambers to their phragmocones allowed ancient cephalopods to reach truly stupendous sizes."

  2. 2
    the thin conical chambered internal shell (either straight or curved) of a belemnite wordnet

Example

More examples

"This ability to continuously add new buoyancy chambers to their phragmocones allowed ancient cephalopods to reach truly stupendous sizes."

Etymology

From phragmo- + cone.

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.