hypotympanotomy

Operative procedure for the excision, without sacrifice of hearing, of small tumors confined to the lower portion of the tympanic cavity. [hypo- + G. tympanon, tympanum, + tome, incision]

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hy·po·tym·pa·not·o·my (hi″po-tim″pə-notґə-me) surgical opening of the hypotympanum.