Meanings
nounphragmocone (plural phragmocones)
plural phragmocones
- biologyThe chambered portion of the shell of certain cephalopods, divided by septa into camerae.First known use 19th c.
This ability to continuously add new buoyancy chambers to their phragmocones allowed ancient cephalopods to reach truly stupendous sizes.
2017, Danna Staaf, Squid Empire, ForeEdge, →ISBN, page 37
Synonyms & antonyms
nounthe thin conical chambered internal shell (either straight or curved) of a belemnite
Similar
phragmacone
Broader
Synonym sets from Open English WordNet, CC BY 4.0.
Origin
Cite this entry
APA
phragmocone. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/phragmocone
MLA
“phragmocone.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/phragmocone. Accessed November 3, 2026.
Chicago
WatkinsX Dictionary, s.v. “phragmocone,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/phragmocone.
Source: phragmocone on Wiktionary, CC BY-SA 4.0.