Definition

1. Noun:
   • A herbivorous dinosaur with a bird-like pelvis structure: An ornithischian dinosaur is a member of a major order (Ornithischia) of dinosaurs characterized primarily by a pelvic structure that resembles that of a bird, where the pubis bone points backward, parallel to the ischium. Despite the similarity in hip structure, birds are actually descended from the other major dinosaur order, the Saurischia. All ornithischians were herbivores.

Examples of Usage

• Noun:
  • The Stegosaurus and Triceratops are both famous examples of an ornithischian dinosaur.
  • Paleontologists identified the fossil as belonging to an ornithischian dinosaur based on the shape of its hip bones.

Advanced Usage

• Scientific Classification: The term is used in formal paleontological and taxonomic contexts to classify dinosaurs within the order Ornithischia, which is distinguished from the Saurischia (lizard-hipped dinosaurs).
  • The discovery provided new insights into the early evolution of the ornithischian dinosaur lineage.

Variants and Related Words

• Ornithischian (noun/adjective): The shorter, more general form of "ornithischian dinosaur." As an adjective, it describes anything related to this order.
  • The museum's new exhibit focuses on ornithischian herbivores.
• Ornithischia (noun): The name of the taxonomic order to which these dinosaurs belong.
  • Ornithischia is one of the two main divisions of dinosaurs.

Synonyms

• Bird-hipped dinosaur: A descriptive synonym that directly explains the defining pelvic characteristic.

Related Phrases

• Thyreophoran, Marginocephalian, Ornithopod: These are names of major subgroups within the Ornithischia. For example, Stegosaurus is a thyreophoran, Triceratops is a marginocephalian, and Iguanodon is an ornithopod.
  • Ornithopods were a highly successful group of ornithischian dinosaurs.

Noun

1. herbivorous dinosaur with a pelvis like that of a bird