WordReference Random House Unabridged Dictionary of American English © 2015
ad•e•noi•dal  (ad′n oidl), 
  1. Anatomyof or pertaining to the adenoids;
  2. Anatomyhaving the adenoids enlarged, esp. to a degree that interferes with normal breathing.
  3. being characteristically pinched and nasal in tone quality:a high-pitched, adenoidal voice.
adenoid + -al1]

WordReference Random House Learner's Dictionary of American English © 2015
ad•e•noid /ˈædəˌnɔɪd/USA pronunciation n. [countable]

    AnatomyUsually, adenoids. [plural] growths of soft tissue in the nasal passage above the throat.

Collins Concise English Dictionary © HarperCollins Publishers::

adenoidal /ˌædɪˈnɔɪdəl/ adj
  1. having the nasal tones or impaired breathing of one with enlarged adenoids

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