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a combining form meaning “living being,” “animal,” used in the formation of compound words:
zoometry; zooplankton.
Also, especially before a vowel, zo-.
Origin of zoo-
combining form representing Greek zôion animal Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for zoo-


combining form
indicating animals: zooplankton
Word Origin
from Greek zōion animal
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
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zoo- in Medicine

zoo- or zo-
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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