Definition of ornithomimid in US English:

ornithomimid

adjective

  • Of, relating to, or designating dinosaurs of the theropod family Ornithomimidae of the late Jurassic and Cretaceous periods, members of which (such as ornithomimus) were bipedal with a slender, somewhat ostrich-like body.

noun

  • A dinosaur of the family Ornithomimidae.

Origin

Early 20th century; earliest use found in Science. From scientific Latin Ornithomimidae, family name from Ornithomimus, genus name + -idae.

Pronunciation

ornithomimid

/ˌɔːnɪθə(ʊ)ˈmʌɪmɪd/