pretreatment

As a noun pretreatment

is any treatment received before some other process.

As a verb preprocessing is

present participle of preprocess.

As nouns the difference between retreatment and pretreatment

is that retreatment is a treatment performed a second or subsequent time while pretreatment is any treatment received before some other process.

As nouns the difference between taxonomy and pretreatment

is that taxonomy is the science or the technique used to make a classification while pretreatment is any treatment received before some other process.

Prediagnosis is a related term of pretreatment.

As nouns the difference between pretreatment and prediagnosis

is that pretreatment is any treatment received before some other process while prediagnosis is a preliminary diagnosis, particularly one made before the occurrence of symptoms.

As an adjective prediagnosis is

prior to diagnosis.