tympanum.

A drum.

Any of various anatomic structures in various animals with analogy to a drum head: The eardrum (tympanic membrane, membrana tympanica).

Any of various anatomic structures in various animals with analogy to a drum head: The main portion of the middle ear: the tympanic cavity (cavitas tympani).

Any of various anatomic structures in various animals with analogy to a drum head: A thin tense membrane covering the hearing organ on the leg or body of some insects, sometimes adapted (as in cicadas) for producing sound.

Any of various anatomic structures in various animals with analogy to a drum head: A membranous resonator in a sound-producing organ in frogs and toads.

Any of various anatomic structures in various animals with analogy to a drum head: (in certain birds) The labyrinth at the bottom of the windpipe.

A vertical recessed triangular space between the sides of a pediment, typically decorated.

A vertical recessed triangular space between the sides of a pediment, typically decorated. The recessed triangular space within an arch, and above a lintel or a subordinate arch, spanning the opening below the arch.

A drum-shaped wheel with spirally curved partitions by which water is raised to the axis when the wheel revolves with the lower part of the circumference submerged; used for raising water, as for irrigation.