Definition of pareiasaurian in English:

pareiasaurian

Pronunciation /pəˌrʌɪəˈsɔːrɪən/

noun

(also pareiosaurian)
  • A fossil reptile of the suborder Pareiasauria; a pareiasaur.

adjective

(also pareiosaurian)
  • Of, relating to, or resembling a pareiasaurian.

Origin

Late 19th century; earliest use found in Philosophical Transactions of the Royal Society of London. From scientific Latin Pareiasauria + -an.