[ ad-n-oid ]
/ ˈæd nˌɔɪd /


Usually adenoids. an enlarged mass of lymphoid tissue in the upper pharynx, often obstructing breathing through the nasal passages.


of or relating to the lymph glands.
of or relating to the adenoids.

Nearby words

  1. adenofibromyoma,
  2. adenofibrosis,
  3. adenogenous,
  4. adenohypophysis,
  5. adenohypophysitis,
  6. adenoid cystic carcinoma,
  7. adenoid facies,
  8. adenoid squamous cell carcinoma,
  9. adenoid tissue,
  10. adenoidal

Origin of adenoid

From the Greek word adenoeidḗs, dating back to 1830–40. See aden-, -oid Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for adenoid

British Dictionary definitions for adenoid


/ (ˈædɪˌnɔɪd) /


of or resembling a gland
of or relating to lymphoid tissue, as that found in the lymph nodes, spleen, tonsils, etc
of or relating to the adenoids

Word Origin for adenoid

C19: from Greek adenoeidēs. See adeno-, -oid

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for adenoid



1839, "gland-like," medical Latin adenoideus, from Greek adenoeides, from aden (genitive adenos) "gland" (see inguinal) + eidos "form" (see -oid). Adenoids "adenoid growths" attested by 1862.

Online Etymology Dictionary, © 2010 Douglas Harper

Medicine definitions for adenoid


[ ădn-oid′ ]


A lymphoid tissue growth located at the back of the nose in the upper part of the throat that when swollen may obstruct normal breathing and make speech difficult.
adenoids Hypertrophy of the pharyngeal tonsil resulting from chronic inflammation.


Of, relating to, or resembling lymphatic glands or lymphatic tissue.
Related formsad′e•noidal (ăd′n-oidl) adj.

The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.