Definition of mesosaurian in US English:

mesosaurian

adjective

  • See mesosaur

    • ‘If the shales at Kimberley are Lower Karroo rocks, then, from the occurrence of Mesosaurus on that horizon, those rocks may be termed Mesosaurian.’
    • ‘The study here developed on the metric relationships of mesosaurian teeth proved to be useful for the identification of isolated pieces.’