Sentence:  On June 9, 1980, national attention was brought to cocaine freebasing when comedian Richard Pryor suffered third degree burns allegedly while using a butane torch to heat cocaine <WSD>freebase</WSD> he had prepared with ether. 
Meaning of the word marked with <WSD> tags:  The purified, dry form of an amine, especially an alkaloid natural product, that is normally used in solution.