Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
† tympănītes, ae, m., = τυμπανίτης, a kind of dropsy that swells the belly like a drum, tympanites, Veg. Vet. 1, 43; Cael. Aur Tard. 3, 8, 101 (in Cels. 3, 21, written as Greek).