Definition of Proostrecum
||Pro*ös"tra*cum (?), n.;
pl. Proöstraca (#). [NL., fr. Gr. &?;
before + &?; shell of a testacean.] (Zoöl.) The
anterior prolongation of the guard of the phragmocone of belemnites
and allied fossil cephalopods, whether horny or calcareous. See
Illust. of Phragmocone.
- Webster's Unabridged Dictionary (1913)
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The correct Spelling of this word is: Proostracum
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