protectant

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pro·tec·tant

 (prə-tĕk′tənt)
n.
One that protects: applied a protectant to the raw wood.

protectant

(prəˈtɛktənt)
n
(Chemistry) a chemical substance that affords protection, as against frost, rust, insects, etc

pro•tect•ant

(prəˈtɛk tənt)

n.
a substance, as a chemical spray, that provides protection, as against insects, frost, or rust.
[1930–35]