variant of zoo- before a vowel: zooid.
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World English Dictionary
zo, zho or dzo (zəʊ)
n , pl zos, zhos, dzos, zo, zho, dzo
a Tibetan breed of cattle, developed by crossing the yak with common cattle
[C20: from Tibetan]
zho, zho or dzo
[C20: from Tibetan]
dzo, zho or dzo
[C20: from Tibetan]

combining form
a variant (before a vowel) of zoo-

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

zo- pref.
Variant of zoo-.

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