Definition of "freebase" in English

noun

1. (chemistry) The purified, dry form of an amine, especially an alkaloid natural product, that is normally used in solution.

   • 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.

2. (specifically) The purified, dry form of certain illegal drugs, especially cocaine.

verb

1. To purify a drug by crystallization.

2. To use a purified drug, especially cocaine, by heating it and inhaling the fumes produced.