Usually means: Bone behind ear, anatomical structure.
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We found 34 dictionaries that define the word mastoid:

General (23 matching dictionaries)
  1. mastoid: Merriam-Webster
  2. mastoid: Oxford Learner's Dictionaries
  3. mastoid: American Heritage Dictionary of the English Language
  4. mastoid: Collins English Dictionary
  5. mastoid: Vocabulary.com
  6. mastoid: Wordnik
  7. Mastoid: InfoVisual Visual Dictionary
  8. mastoid: Wiktionary
  9. mastoid: Webster's New World College Dictionary, 4th Ed.
  10. mastoid: The Wordsmyth English Dictionary-Thesaurus
  11. mastoid: Infoplease Dictionary
  12. mastoid: Dictionary.com
  13. mastoid: Online Etymology Dictionary
  14. Mastoid: Wikipedia, the Free Encyclopedia
  15. Mastoid: Online Plain Text English Dictionary
  16. mastoid: Webster's Revised Unabridged, 1913 Edition
  17. mastoid: Rhymezone
  18. Mastoid: AllWords.com Multi-Lingual Dictionary
  19. mastoid: Webster's 1828 Dictionary
  20. mastoid: FreeDictionary.org
  21. mastoid: The Phrontistery - A Dictionary of Obscure Words
  22. mastoid: TheFreeDictionary.com
  23. mastoid: Mnemonic Dictionary

Art (1 matching dictionary)
  1. mastoid-: A Cross Reference of Latin and Greek Elements

Computing (1 matching dictionary)
  1. mastoid: Encyclopedia

Medicine (8 matching dictionaries)
  1. mastoid: Merriam-Webster Medical Dictionary
  2. Dorland's Illustrated Medical Dictionary (No longer online)
  3. Mastoid: MedTerms.com Medical Dictionary
  4. online medical dictionary (No longer online)
  5. Health and Wellness Dictionary (No longer online)
  6. mastoid, mastoid-: Medical dictionary
  7. Mastoid: Drug Medical Dictionary
  8. Hyperdictionary (No longer online)

Slang (1 matching dictionary)
  1. mastoid: Urban Dictionary

(Note: See mastoids as well.)

Definitions from Wiktionary (mastoid)

adjective:  (anatomy) Being the process of the temporal bone behind the ear.
adjective:  (zootomy) Being any of several bony elements that occupy a similar position in the skull of lower vertebrates.
adjective:  (anatomy) Of or relating to the mastoid process of the temporal bone.
noun:  (anatomy) Ellipsis of mastoid process.. [(anatomy) The conical, nipplelike projection of the petrous part of the temporal bone, that is situated behind the ear in humans and many other vertebrates, and serves as a site of muscle attachment.]
noun:  (pathology, informal) Clipping of mastoiditis. [(pathology) Inflammation of the mastoid process of the temporal bone.]

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