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Webster 1913 Edition
Proostracum
‖
Pro-ös′tra-cum
,Noun.
pl.
Proostraca
(#)
. [NL., fr. Gr. [GREEK] before + [GREEK] shell of a testacean.]
(Zool.)
The anterior prolongation of the guard of the phragmocone of belemnites and allied fossil cephalopods, whether horny or calcareous. See Illust. of
Phragmocone
. Definition 2024
proostracum
proostracum
English
Noun
proostracum (plural proostraca)
- (zoology) The anterior prolongation of the guard of the phragmocone of belemnites and allied fossil cephalopods, whether horny or calcareous.