pachycephalosaur /ˌpakɪˈsɛf(ə)ləsɔː
, ˌpakɪˈkɛf(ə)ləsɔː
/ ▸ noun a bipedal herbivorous dinosaur of the late Cretaceous period, with a thick domed skull. Infraorder Pachycephalosauria, order Ornithischia: several genera, including Pachycephalosaurus.
– ORIGIN from Greek pakhus ‘thick’ + kephalē ‘head’ + sauros ‘lizard’.