- 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
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
before a vowel zo-
- indicating animalszooplankton
from Greek zōion animal
- Animal; animal kingdom:zoonosis.