from the GNU version of the Collaborative International Dictionary of English
- n.pl. A comprehensive group of vertebrates, comprising the reptiles and birds.
from The Century Dictionary and Cyclopedia
- In Huxley's classification, a superclass of vertebrates; one of three prime divisions of Vertebrata, in which birds and reptiles are brigaded together and contrasted on the one hand with Ichthyopsida, or amphibians and fishes, and on the other with Mammalia, or mammals.
Sorry, no etymologies found.