DICT.TW Dictionary Taiwan
18.216.70.205
Search for:
▼[Show options]
[Pronunciation] [Help] [Database Info] [Server Info]

1 definition found

From: Webster's Revised Unabridged Dictionary (1913)

 Pro·ös·tra·cum n.; pl. Proostraca   Zool. The anterior prolongation of the guard of the phragmocone of belemnites and allied fossil cephalopods, whether horny or calcareous. See Illust. of Phragmocone.
 ◄ ►