Definition

1. Noun:
   • A taxonomic order of large, flightless birds: "order Casuariiformes" is the scientific classification for a group of ratite birds characterized by their large size, inability to fly, and strong legs adapted for running. This order primarily includes the cassowaries and emus.

Usage Examples

• Noun:
  • The cassowary and the emu are both classified under the order Casuariiformes.
  • Biologists study the evolutionary history of the order Casuariiformes.

Advanced Usage

• In taxonomic hierarchy: The term is used in scientific contexts to specify a precise level of biological classification (order) within the class Aves (birds).
  • The order Casuariiformes falls under the infraclass Palaeognathae.

Variants and Related Words

• Casuariiform (adj): Of or relating to the order Casuariiformes.
  • The casuariiform skeleton shows adaptations for a terrestrial lifestyle.

Synonyms

• Ratite order: A broader informal term referring to any bird order within the ratites, which includes the Casuariiformes.

Noun

1. a ratite bird order: cassowaries and emus