Definition of "birdcage" [birdcage]

• A cage for birds. (noun)
• Slang The controlled air traffic space near an airport. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "I will concede that the image of a cow squeezed into a birdcage is amusing."
• "I didn't realize that the birdcage was a symbol of domestic happiness for Victorians."
• "This became known as the birdcage thesis, and Chen and his allies were intent on keeping the bird in its cage."