from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Incapable of flying. Used of certain birds, such as the penguin.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Unable to fly. Usually used with birds such as the penguin, ostrich, and emu.
from The Century Dictionary and Cyclopedia
- Incapable of flying.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- adj. incapable of flying
From flight + -less. (Wiktionary)