Definition of ostrich dinosaur in US English:

ostrich dinosaur

noun

  • A lightly built toothless bipedal dinosaur of the late Cretaceous period, adapted for running and somewhat resembling an ostrich.

    Infraorder Ornithomimisauria, suborder Theropoda, order Saurischia: several genera, including Gallimimus, Ornithomimus, and Struthiomimus

    Also called ornithomimosaur
    • ‘Despite the reptile's resemblance to an ostrich dinosaur, or ornithomimid, Effigia is actually some 80 million years older.’
    • ‘Ankle aside, Effigia had large eyes, a long tail, and a toothless beak - not unlike the ostrich dinosaurs.’