Why is ounces abbreviated with oz.?
I checked Dictionary.com and found this explanation. It's originally from an Italian word.
Dictionary.com Unabridged (v 1.1) - Cite This Source - Share This
oz.
ounce; ounces.
--------------------------------------------------------------------------------
[Origin: abbr. of It onza]
Dictionary.com Unabridged (v 1.1)
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2006.