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Definitions

American Heritage® Dictionary of the English Language, Fourth Edition

  1. n. One of two masses of lymphoid tissue located at the back of the nose in the upper part of the throat that may obstruct normal breathing and make speech difficult when swollen. Often used in the plural.
  2. adj. Of or relating to lymphatic glands or lymphoid tissue; lymphoid.

Century Dictionary and Cyclopedia

  1. In the form of a gland; glandiform; glandular.
  2. Of or pertaining to glands, especially to those of the lymphatic system.
  3. n. An adenoid growth; specifically, an adenoid vegetation.

Wiktionary

  1. adj. Of or relating to lymphatic glands or lymphoid tissue; lymphoid.
  2. n. One of two folds of lymphatic tissue covered by ciliated epithelium. They are found in the roof and posterior wall of the nasopharynx at the back of the throat behind the uvula. They may obstruct normal breathing and make speech difficult when swollen, a condition often called adenitis.

GNU Webster's 1913

  1. n. A swelling produced by overgrowth of the adenoid tissue in the roof of the pharynx; -- usually in pl.
  2. adj. Glandlike; glandular.

WordNet 3.0

  1. n. a collection of lymphatic tissue in the throat behind the uvula (on the posterior wall and roof of the nasopharynx)
  2. adj. relating to or resembling lymphatic glands or lymphoid tissue

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‘adenoid’ has been looked up 886 times, added to 2 lists, and has a Scrabble score of 9.