Usually means: Cavity within a body organ.
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We found 30 dictionaries that define the word antrum:

General (20 matching dictionaries)
  1. antrum: Merriam-Webster
  2. antrum: Oxford Learner's Dictionaries
  3. antrum: American Heritage Dictionary of the English Language
  4. antrum: Collins English Dictionary
  5. antrum: Vocabulary.com
  6. Antrum, antrum: Wordnik
  7. antrum: Wiktionary
  8. antrum: Webster's New World College Dictionary, 4th Ed.
  9. antrum: The Wordsmyth English Dictionary-Thesaurus
  10. antrum: Infoplease Dictionary
  11. antrum: Dictionary.com
  12. Antrum: Wikipedia, the Free Encyclopedia
  13. Antrum: Online Plain Text English Dictionary
  14. antrum: Webster's Revised Unabridged, 1913 Edition
  15. antrum: Rhymezone
  16. Antrum: AllWords.com Multi-Lingual Dictionary
  17. antrum: FreeDictionary.org
  18. antrum: Mnemonic Dictionary
  19. antrum: TheFreeDictionary.com
  20. antrum: Merriam-Webster

Computing (1 matching dictionary)
  1. antrum: Encyclopedia

Medicine (9 matching dictionaries)
  1. antrum: Merriam-Webster Medical Dictionary
  2. Dorland's Illustrated Medical Dictionary (No longer online)
  3. Antrum: MedTerms.com Medical Dictionary
  4. Digestive Diseases Dictionary (No longer online)
  5. online medical dictionary (No longer online)
  6. DICTIONARY OF TERMS IN ORAL PHYSIOLOGY (No longer online)
  7. antrum: Medical Etymology Anatomy
  8. antrum: Medical dictionary
  9. Antrum: Drug Medical Dictionary

(Note: See antra as well.)

Definitions from Wiktionary (antrum)

noun:  (biology) A bodily cavity, especially one having bony walls, especially one in the sinuses.

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    charcoal,     graphite,     pewter,     smoke,     gunmetal, more...



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