Definition of ostrich dinosaur in 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

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