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  • zoo
    zoo
    noun
    a parklike area in which live animals are kept in cages or large enclosures for public exhibition.
  • zoo-
    zoo-
    a combining form meaning “living being,” “animal,” used in the formation of compound words.
Synonyms

zoo

1 American  
[zoo] / zu /

noun

plural

zoos
  1. Also called zoological garden.  a parklike area in which live animals are kept in cages or large enclosures for public exhibition.

  2. Informal. a place, activity, or group marked by chaos or unrestrained behavior.


zoo- 2 American  
  1. a combining form meaning “living being,” “animal,” used in the formation of compound words.

    zoometry; zooplankton.


zoo- 1 British  

combining form

  1. indicating animals

    zooplankton

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

zoo 2 British  
/ zuː /

noun

  1. Formal term: zoological garden.  a place where live animals are kept, studied, bred, and exhibited to the public

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

zoo Idioms  
  1. see it's a zoo.


Usage

What does zoo- mean? The combining form zoo- is used like a prefix meaning “living being” or "animal." It is often used in scientific terms, especially in biology. The form zoo- comes from Greek zôion, meaning “animal.”What are variants of zoo-?When combined with words or word elements that begin with a vowel, zoo- becomes zo-, as in zooid. When combined as a suffix, zoo- becomes -zoa or -zoon, as in protozoa or ectozoon. Want to know more? Read our Words That Use articles for zo-, -zoa, and -zoon.

Etymology

Origin of zoo1

First recorded in 1840–50; first two syllables of zoological garden taken as one syllable

Origin of zoo-2

Combining form representing Greek zôion animal

Explanation

A zoo is a large park where wild animals are on display. If you're interested in lemurs, orangutans, or even boa constrictors, you might want to plan a trip to the zoo. Most modern zoos serve two functions: to exhibit exotic animals for paying visitors and to protect endangered animal species. Responsible zoos fulfill the second goal by breeding animals, educating the public, and reintroducing animals to the wild. Any wild and crowded place can also be called a zoo: "I went to the mall the day before Christmas. It was a total zoo!" The word zoo, from a Greek root that means "animal," was originally shorthand for the Regent's Park Zoological Gardens in London, which opened in 1828.

Keep Reading on Vocabulary.com

Vocabulary lists containing zoo

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

He's talking about his self-titled Albon Zoo of 14 cats, dogs and horses that will be well-known to fans of Netflix's popular F1 doc Drive to Survive.

From BBC • Apr. 30, 2026

The centre at London Zoo in Regent's Park, central London, is being funded by an anonymous donation that is the biggest in conservation charity ZSL's 200-year history.

From BBC • Apr. 29, 2026

Ahead of their repatriation to Kenya, Prague Zoo said each animal would undergo "acclimatisation and detailed monitoring before being gradually integrated" at the MKWC's breeding programme.

From BBC • Apr. 29, 2026

The plucky little lion has since been transferred to the Oakland Zoo, where veterinarians are hopeful he will make a full recovery.

From Los Angeles Times • Apr. 3, 2026

They bore a distinct similarity to the ones Mama had said to her at the Night Zoo.

From "Beasts of Prey" by Ayana Gray