zoo-

Also especially before a vowel, zo-.

Origin of zoo-

combining form representing Greek zôion animal
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for zoo-

zoo-

before a vowel zo-

combining form
  1. indicating animalszooplankton

Word Origin for zoo-

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

zoo- in Medicine

zoo-

pref.
  1. Animal; animal kingdom:zoonosis.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.