freebaseWiktionary 原文英美构词拆解freefree词干basebase词干词源说明From free + base.释义名词noun1(chemistry) The purified, dry form of an amine, especially an alkaloid natural product, that is normally used in solution.2specificallyThe purified, dry form of certain illegal drugs, especially cocaine.动词verb1To purify a drug by crystallization.2To use a purified drug, especially cocaine, by heating it and inhaling