Sentence:  When authorities convicted him of practicing <WSD>medicine</WSD> without a license ( he got off with a suspended sentence of three years because of his advanced age of 77 ) , one of his victims was not around to testify : He was dead of cancer . 
Meaning of the word marked with <WSD> tags:  the learned profession that is mastered by graduate training in a medical school and that is devoted to preventing or alleviating or curing diseases and injuries