Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A park or an institution in which living animals are kept and usually exhibited to the public. Also called zoological garden.
  • n. Slang A place or situation marked by confusion or disorder: The bus station is a zoo on Fridays.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A park where live animals are exhibited.
  • n. Any place that is wild, crowded, or chaotic.

Etymologies

Short for zoological garden.
(American Heritage® Dictionary of the English Language, Fourth Edition)
Shortened form of zoological garden, and now the usual form. See zoology. (Wiktionary)

Examples

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