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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.
Historical Examples

When this adenoid tissue grows abnormally large it forms what are known as “adenoids.”
Adenoids: What They Are, How To Recognize Them, What To Do For Them United States, Public Health Service

This cushion is formed of what doctors call “adenoid tissue” and is similar to that which makes up the tonsils.
Adenoids: What They Are, How To Recognize Them, What To Do For Them United States, Public Health Service

He has a ribbon-counter, adenoid voice production that no really fine artist could afford.
Adventures in the Arts Marsden Hartley

At the conclusion of the film Kedzie was saddened by a ballad sung by an adenoid tenor.
We Can’t Have Everything Rupert Hughes

adenoid growths appear as grape-like lymphoid formations located in the upper and posterior-nasal pharynx.
The Mother and Her Child William S. Sadler

There is no need to attempt removal of adenoid tissue on the lateral walls.
A System of Operative Surgery, Volume IV (of 4) Various

It is said to be due to a partial asphyxia during sleep from Page 90 adenoid vegetation.
The Nervous Child Hector Charles Cameron

A very large majority of these coughs are caused by adenoid growths in the back part of the nose.
The Eugenic Marriage, Volume IV. (of IV.) Grant Hague

Still further, irritation and an unstable mucous membrane results, with polypi or adenoid vegetation following.
Degeneracy Eugene S. Talbot

Repeated attacks are said to contribute to the production of adenoid growths.
The Eugenic Marriage, Volume IV. (of IV.) Grant Hague

adjective
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
adj.

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.

adenoid ad·e·noid (ād’n-oid’)
n.

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.

adj.
Of, relating to, or resembling lymphatic glands or lymphatic tissue.ad’e·noi’dal (ād’n-oid’l) adj.