zoo-

zoo-

a combining form meaning “living being,” “animal,” used in the formation of compound words: zoometry; zooplankton.
Also, especially before a vowel, zo-.


Origin:
combining form representing Greek zôion animal
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Zoo- is always a great word to know.
So is ninnyhammer. Does it mean:
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
a fool or simpleton; ninny.
Collins
World English Dictionary
zoo- or (before a vowel) zo-
 
combining form
indicating animals: zooplankton
 
[from Greek zōion animal]
 
zo- or (before a vowel) zo-
 
combining form
 
[from Greek zōion animal]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Medical Dictionary

zoo- or zo-
pref.
Animal; animal kingdom: zoonosis.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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