Definition of post-tympanic in US English:

post-tympanic

adjective

Zoology
  • Designating a process of the squamosal bone in some vertebrates which arches over the tympanic bone of the ear.

noun

Zoology
  • The post-tympanic bone.

Origin

Mid 19th century; earliest use found in Richard Owen (1804–1892), comparative anatomist and palaeontologist.