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phragmacone
 

Definitions from WordNet

Noun phragmacone has 1 sense
  1. phragmocone, phragmacone - the thin conical chambered internal shell (either straight or curved) of a belemnite
    --1 is a kind of shell

Definitions from the Web

Phragmacone

Definition: The internal chambered structure found in the shell of a cephalopod, such as a squid or an ammonite.

Examples:

  1. The phragmacone of the ammonite fossil was beautifully preserved.
  2. The phragmacone in the shell of the squid controls its buoyancy.
  3. Researchers study the growth patterns in the phragmacone to understand the life of ancient cephalopods.

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