pachycephalosaurid
/ˌpakɪˌsɛf(ə)ləˈsɔːrɪd/ /ˌpakɪˌsɛf(ə)ləˈsɔːrɪd/ /ˌpakɪˌkɛf(ə)ləˈsɔːrɪd/Palaeontology
noun
A bipedal herbivorous ornithischian dinosaur of the late Cretaceous genus Pachycephalosaurus or a related genus of the family Pachycephalosauridae (or infraorder Pachycephalosauria), characterized by a thickened, dome-like skull.
adjective
Of, relating to, or designating dinosaurs of the genus Pachycephalosaurus and related genera.
Origin
1970s; earliest use found in Discovery. From Pachycephalosaurus + -id. Compare scientific Latin Pachycephalosauridae, family name.