n.
a flanged metal or plastic tube that is inserted in the eardrum in cases of glue ear. It allows air to enter the middle ear, bypassing the patient's own nonfunctioning Eustachian tube.
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grom·met (gromґət) 1. a tube inserted through the tympanic membrane for drainage of the middle ear. 2. a metal or plastic ring used to reinforce a hole made in a softer material.Medical dictionary. 2011.