Definition of suprapygal in US English:

suprapygal

noun

Zoology
  • (In tortoises and turtles) a plate of the carapace located immediately in front of the pygal plate.

adjective

Zoology
  • Of or relating to such a plate.

Origin

Late 19th century; earliest use found in Henry Nicholson (1844–1899), biologist and geologist.