Usually means: Outer shell layer in crustaceans.
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We found 9 dictionaries that define the word proostracum:

General (8 matching dictionaries)
  1. proostracum: Merriam-Webster
  2. proostracum: Wordnik
  3. proostracum: Wiktionary
  4. Proostracum, proostracum: Dictionary.com
  5. Proostracum: Online Plain Text English Dictionary
  6. Proostracum: AllWords.com Multi-Lingual Dictionary
  7. proostracum: FreeDictionary.org
  8. Proostracum: TheFreeDictionary.com

Medicine (1 matching dictionary)
  1. online medical dictionary (No longer online)

Definitions from Wiktionary (proostracum)

noun:  (paleontology) The anterior prolongation of the guard of the phragmocone of belemnites and allied fossil cephalopods, whether horny or calcareous.

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