myringotome

my·rin·go·tome

(mi-ring'gō-tōm), A knife used for paracentesis of the tympanic cavity. [myringo- + G. tomē, excision]

myringotome

(mĭ-rĭn′gō-tōm) [″ + Gr. tome, incision] Surgical knife used for incising the tympanic membrane.