Definition of postzygapophysis in US English:

postzygapophysis

noun

Anatomy Zoology
  • Either of the two posterior or inferior articular processes (left and right) on the neural arch of a vertebra, which articulate with the prezygapophyses of the vertebra below or behind.

Origin

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