verb (used with object)
to treat in advance or as part of a preliminary treatment: to pretreat wood before staining it.

1930–35; pre- + treat

pretreatment, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
Some industrial users are required to pretreat their wastewater prior to discharge to the sewer.
Not all log-home manufacturers pretreat logs with wood preservatives at the factory.
The salt brine can be used to pretreat the roadways before a storm to help reduce the bond between snow and the pavement.
These systems pretreat the wastewater before the effluent is released to the drain field.
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