What does detartrated mean?

Tartrated means containing tartar. Tartar is a white crystalline salt KHC4H4O6 found in grapes. So "detartrated" means having the tartar removed, usually in reference to grapes or wine.

There is another meaning, however, suggested by a 1968 paper in Google Scholar entitled "The technique of detartration and curettage in the prevention and treatment of periodontal diseases." Yes, removal of tartar from teeth is detartration. Therefore, every time the dentist cleans our teeth, we have been detartrated!