Definition of pelycosaurian in English:

pelycosaurian

adjective

  • Of, relating to, designating, or characteristic of a pelycosaur or pelycosaurs.

Origin

Late 19th century; earliest use found in American Naturalist. From scientific Latin Pelycosauria + -an. With use as noun compare slightly later pelycosaur.

Pronunciation

pelycosaurian

/ˌpɛlɪkəˈsɔːrɪən/