The Collaborative International Dictionary of English v.0.48:
Tympany \Tym"pa*ny\, n. [Gr. ?, fr. ? a kettledrum. See Tympanites.] 1. (Med.) A flatulent distention of the belly; tympanites. --Fuller. [1913 Webster] 2. Hence, inflation; conceit; bombast; turgidness. "Thine's a tympany of sense." --Dryden. [1913 Webster] A plethoric a tautologic tympany of sentence. --De Quincey. [1913 Webster]