pretreat
verb
pre·treat ˌprē-ˈtrēt 
variants or pre-treat
pretreated or pre-treated; pretreating or pre-treating
transitive verb
: to treat previously : to subject to pretreatment
pretreat the stain before washing
pretreated the roads with sand/salt before the snowstorm
pretreating wastewater
… he now pretreats patients with medicines to counter possible reactions.
Elisabeth Rosenthal
Elisabeth Rosenthal
Word History
First Known Use
1926, in the meaning defined above
Medical Definition
pretreat
transitive verb
pre·treat -ˈtrēt
: to subject to pretreatment