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1. Relating to or resembling a drum.
2. also tym·pa·nal (tĭm′pə-nəl) Anatomy Of or relating to the middle ear or eardrum.

[From Latin tympanum, drum; see tympanum.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


of or relating to the tympanum
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
References in periodicals archive ?
A computed tomography (CT) scan of the head showed thickening of the ear skin; focal tympanal bone osteolysis; partial right mastoid air cells and middleear cavity opacification; and osteolysis of the occipital, styloid, and mastoid bones consistent with MOE (Appendix Figure, https://wwwnc.cdc.gov/EID/article/25/4/18-0710App1.pdf).
Disceratus has short and slit-like tympanal openings which are situated laterally on the base of the fore tibiae (about 1/3 of total tibial width removed from the edges of the flat dorsal surface), whereas in Gnathoclita the openings seem to be wider and coincide with the dorsal edges of the tibiae.
fore coxae with spine or without spine, femora usually lack spines from lower side, fore tribe and midtibiae with longitudinal upper groove; lacking marginal spines (single apical spine); fore tibiae with markedly widened base; thin distally opening of tympanal organ exposed, oval, covered by membrane; Subgenital plate of male not bifurcating into two long lobes, not tubular, usually without apical styles.
Body large; pronotum with deep humeral notch on lateral lobes; tegmen wide ,fully developed ;wings longer than tegmen; fore coxae with long soine, femur with spinosa on lower side ;fore tibiae, mid\tibiae with longitudinal groove on upper side, tibiae widened basally; posterior opening of tympanal organ, oval, membranous exposed; anterior opening concealed by swelling; in from of wide slit externally; terminal abdominal tergite with tubercles; subgenital plate of male with styles; ovipositor not shorter then pronotum, varying in shape, fully developed.
Researchers in Scotland played high-pitched tones for greater wax moths (one shown) and used a laser to measure nanometer-sized vibrations of the moths' tympanal membranes, structures similar to human eardrums.
It can be physical in the sense of exemplifying advanced sonic concepts (such as texturing and auditory illusions); it can be so in the sense of exerting both atmospheric and tympanal (as in eardrum) pressure.
"The butterfly's tympanal membrane works like [a human] eardrum, in that it vibrates in response to sound waves" says Kathleen Lucas, a biologist at Carleton University in Ottawa, Canada.
Musotimines are defined by their laterally compressed antennae with flattened segments, [R.sub.2] stalked with [R.sub.3]+ [R.sub.4] (but not in Albusambia), a reduced coecum in the aedeagus of the male genitalia, and enlarged tympanal cases (Minet 1985, Yoshiyasu 1985, Yen 1996).
Etude sur les origines, l'evolution, la technique, et les themes du decor tympanal (BEFAR 165), Paris.
Anatomically rather unconventional, the fly's auditory system is endowed with a directional sensitivity that is based on the mechanical coupling between its two hemi lateral tympanal membranes.
pseudosphex more elongate relative to its width and often [but not always] with a small spine on dorsolateral margin at the distal face of the tympanal expansion).