What does W/O stand for?

MLA style: "W/O." Acronym Finder . 2012. AcronymFinder.com 12 Feb. 2012 <a href="http://www.acronymfinder.com/Water-in-Oil-(emulsion-used-widely-in-cosmetics)-(W%2fO).html">http://www.acronymfinder.com/Water-in-Oil-(emulsion-used-widely-in-cosmetics)-(W%2fO).html
Chicago style: Acronym Finder . S.v. "W/O." Retrieved February 12 2012 from <a href="http://www.acronymfinder.com/Water-in-Oil-(emulsion-used-widely-in-cosmetics)-(W%2fO).html">http://www.acronymfinder.com/Water-in-Oil-(emulsion-used-widely-in-cosmetics)-(W%2fO).html
APA style: W/O. (n.d.) Acronym Finder. (2012). Retrieved February 12 2012 from <a href="http://www.acronymfinder.com/Water-in-Oil-(emulsion-used-widely-in-cosmetics)-(W%2fO).html">http://www.acronymfinder.com/Water-in-Oil-(emulsion-used-widely-in-cosmetics)-(W%2fO).html

Water in Oil (emulsion used widely in cosmetics)

This definition appears very rarely and is found in the following Acronym Finder categories:

Science, medicine, engineering, etc.

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Samples in periodicals archive:

Drouin said ProSep has among the top technologies for purifying or "polishing" water in oil and gas production to allow the water to be reused or safely disposed.

United States : Firm plans aggressive growth