Usually, adenoids. an enlarged mass of lymphoid tissue in the upper pharynx, often obstructing breathing through the nasal passages. See diag. under tonsil.
of or pertaining to the lymph glands.
of or pertaining to the adenoids.

1830–40; < Greek adenoeidḗs. See aden-, -oid Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
adenoid (ˈædɪˌnɔɪd)
1.  of or resembling a gland
2.  of or relating to lymphoid tissue, as that found in the lymph nodes, spleen, tonsils, etc
3.  of or relating to the adenoids
[C19: from Greek adenoeidēs. See adeno-, -oid]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1839, "gland-like," medical L., from Gk. adenoeides, from aden (gen. adenos) "gland" + eidos "form" (see -oid). Adenoids "adenoid growths" is from 1891.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

adenoid ad·e·noid (ād'n-oid')

  1. 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.

  2. adenoids Hypertrophy of the pharyngeal tonsil resulting from chronic inflammation.

Of, relating to, or resembling lymphatic glands or lymphatic tissue.
ad'e·noi'dal (ād'n-oid'l) adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Antibiotics may be used to treat tonsil, adenoid, and sinus infections when they occur.
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