phragmocone

Phragmocone

Phrag"mo*cone\, n. [Gr. ?, ?, a fence, an inclosure + ? a cone.] (Zo["o]l.) The thin chambered shell attached to the anterior end of a belemnite. [Written also phragmacone.]
Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc.
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WordNet
phragmocone

noun
the thin conical chambered internal shell (either straight or curved) of a belemnite 
WordNet® 3.0, © 2006 by Princeton University.
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