Definition of pretreatment in US English:

pretreatment

noun

  • The treatment of something with a chemical before use.

    ‘the pretreatment of the wood had several beneficial effects on the pulping process’
    count noun ‘our new technique uses a lot less water than previous pretreatments’

Pronunciation

pretreatment

/ˌprēˈtrētm(ə)nt//ˌpriˈtritm(ə)nt/