adenoid

(noun) a collection of lymphatic tissue in the throat behind the uvula (on the posterior wall and roof of the nasopharynx). Synonyms: pharyngeal tonsil, Luschka's tonsil, third tonsil, tonsilla pharyngealis, tonsilla adenoidea. Examples: "Hypertrophy of the pharyngeal tonsils is called adenoids." "Enlarged adenoids may restrict the breathing of children."

(adj) relating to or resembling lymphatic glands or lymphoid tissue.