Etymology
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adenoid (adj.)

1839, "gland-like," from medical Latin adenoideus, from Greek adenoeides, from adēn (genitive adēnos) "gland" (see adeno-) + eidos "form" (see -oid). Adenoids (n.) "adenoid growths" is attested by 1856.

updated on September 15, 2022

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Definitions of adenoid from WordNet
1
adenoid (n.)
a collection of lymphatic tissue in the throat behind the uvula (on the posterior wall and roof of the nasopharynx);
enlarged adenoids may restrict the breathing of children
hypertrophy of the pharyngeal tonsils is called adenoids
Synonyms: pharyngeal tonsil / Luschka's tonsil / third tonsil / tonsilla pharyngealis / tonsilla adenoidea
2
adenoid (adj.)
relating to or resembling lymphatic glands or lymphoid tissue;
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.