a. (sb.) Anat. and Zool. [f. TYMPAN-UM + -AL. So F. and Pg. tympanal.] = TYMPANIC 1.

1

1822–9.  Good, Study Med. (ed. 3), IV. 273. An impeded motion of the air in the tympanal cavity.

2

1875.  Sir W. Turner, in Encycl. Brit., I. 806/2. Alexander Achillini of Bologna … the first who described the two tympanal bones, termed malleus and incus.

3

1887.  Amer. Naturalist, XXI. 579. The only organs [in insects] which might be interpreted as answering functionally to an ear are the so-called tympanal organs of Orthoptera.

4

  B.  sb. A tympanal or tympanic bone.

5

1875.  C. C. Blake, Zool., 202. The upper jaw is represented by the vomer, the palatines, and the tympanals.

6

1883.  Science, I. 506/2. The tympanal is a horseshoe-like bone.

7