Definition of megalosaurid in US English:

megalosaurid

noun

  • A member of the genus Megalosaurus or related genera (originally regarded as members of a distinct family) of large carnivorous dinosaurs.

adjective

  • Of, relating to, or designating dinosaurs of a group related to Megalosaurus.

Origin

1920s; earliest use found in Bulletin of the American Museum of Natural History. From scientific Latin Megalosauridae, family name from Megalosaurus + -idae.