adenoid

n. growth of lymphoid tissue located in the upper pharynx

Adenoids (or pharyngeal tonsils, or nasopharyngeal tonsils) are a mass of lymphoid tissue situated at the very back of the nose, in the roof of the nasopharynx, where the nose blends into the mouth. Normally, in children, they make a soft mound in the roof and posterior wall of the nasopharynx, just above and behind the uvula.
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Adenoid /ad·e·noid/ 1. pharyngeal tonsil. 2. pertaining to a pharyngeal tonsil. 3. resembling a gland. 4. [more]Adenoid - Community and Resources

Noun
1. a collection of lymphatic tissue in the throat behind the uvula (on the posterior wall and roof of the nasopharynx); "hypertrophy of the pharyngeal tonsils is called adenoids"; "enlarged adenoids may restrict the breathing of children"
(synonym) pharyngeal tonsil, Luschka's tonsil, third tonsil, tonsilla pharyngealis, tonsilla adenoidea
(hypernym) lymphatic tissue, lymphoid tissue
(part-holonym) throat, pharynx
Adjective
1. relating to or resembling lymphatic glands or lymphoid tissue
(pertainym) pharyngeal tonsil, Luschka's tonsil, third tonsil, tonsilla pharyngealis, tonsilla adenoidea

n. adenoid, growth of lymphoid tissue located in the upper pharynx