Usually means: Glandular tissue behind nasal cavity.
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We found 26 dictionaries that define the word adenoid:

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

Computing (1 matching dictionary)
  1. adenoid: Encyclopedia

Medicine (4 matching dictionaries)
  1. adenoid: Merriam-Webster Medical Dictionary
  2. Dorland's Illustrated Medical Dictionary (No longer online)
  3. online medical dictionary (No longer online)
  4. adenoid: Medical dictionary

(Note: See adenoids as well.)

Definitions from Wiktionary (adenoid)

adjective:  (medicine, relational)
adjective:  Of or relating to lymphatic glands or lymphoid tissue.
adjective:  Of or pertaining to the adenoids.
adjective:  Relating to, affected with, or associated with abnormally enlarged adenoids.
noun:  (medicine) an abnormally enlarged mass of lymphatic tissue at the back of the pharynx, often obstructing the nasal and ear passages and hindering speaking and breathing in young children.
noun:  (anatomy, usually in the plural) Such a mass when not abnormally enlarged, covered by ciliated epithelium and located in the roof and posterior wall of the nasopharynx at the back of the throat behind the uvula.

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