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oz.

1.
ounce; ounces.
Origin of oz.
abbreviation of Italian onza
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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abbreviation of ounce (n.1), 1540s, from Italian oz. (15c.), abbreviation of onza.

Online Etymology Dictionary, © 2010 Douglas Harper
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