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protectant

[pruh-tek-tuh nt] /prəˈtɛk tənt/
noun
1.
a substance, as a chemical spray, that provides protection, as against insects, frost, rust, etc.; protective agent.
Origin
1660-1670
1660-70, for an earlier sense; protect + -ant
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for protectant

protectant

/prəˈtɛktənt/
noun
1.
a chemical substance that affords protection, as against frost, rust, insects, etc
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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