Definitions from Wiktionary (freebase)

▸ noun:  (chemistry) The purified, dry form of an amine, especially an alkaloid natural product, that is normally used in solution.
▸ noun:  (specifically) The purified, dry form of certain illegal drugs, especially cocaine.
▸ verb:  To purify a drug by crystallization.
▸ verb:  To use a purified drug, especially cocaine, by heating it and inhaling the fumes produced.

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