freebase

1. (chemistry) The purified, dry form of an amine, especially an alkaloid natural product, that is normally used in solution.Examples: "The freebase is heated in a retort, foil, or other container and the vapor is inhaled as the freebase vaporizes."; "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 freebase he had prepared with ether."; "2007, Jared Ledgard, A Laboratory History of Narcotics, Volume 1: Amphetamines and Derivatives, page 108, Note: this freebase methedrine will actually be a mixture of the DL and L-forms, from which the L-form is the most common used in the preparation of methamphetamine."countableuncountable

2. (specifically) The purified, dry form of certain illegal drugs, especially cocaine.Examples: "That day, I gave a class on making and using freebase. This was one thing that was to be done perfectly, or you could end up with glass and freebase all over you."countablespecificallyuncountable