from the GNU version of the Collaborative International Dictionary of English
- n.pl. The class of Vertebrata that includes the birds.
from The Century Dictionary and Cyclopedia
- Birds; feathered animals, considered as a class of vertebrates,next after mammals: sometimes united with Reptilia in a superclass Sauropsida, distinguished on the one hand from Mammalia, and on the other from Ichthyopsida, or amphibians and fishes together.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. (ornithology) the class of birds
Sorry, no etymologies found.