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v. free·based, free·basing, free·bases
1. To purify (cocaine) by treating its powdered hydrochloride form with an alkaloid solution such as ammonia and then using a heated solvent to separate out the precipitate.
2. To use (cocaine purified in this way) by smoking it or by inhaling the fumes after burning it.
To prepare or use cocaine purified in this way.
Cocaine purified by this method.

free′bas′er n.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.
References in periodicals archive ?
For White males, AVs significantly associated with perceptions of mental health were missed school because felt unsafe (p = .0010), in a physical fight (p = .0001), number of cigarettes per day past 30 days (p = .0063), past 30 days binge drank alcohol (p = .0001), times used marijuana (p = .0051), times used cocaine (p = .0007), times used crack or freebase cocaine (p = .0082), type of birth control at last sexual intercourse (p = .0025), times yesterday ate fruit (p = .0019), and reason had not had sexual intercourse (p = .0001).
Thirteen items on behaviors thought to result in the most mortality, morbidity, and social problems from alcohol and drug use were included to measure lifetime use of alcohol, frequency of alcohol use in the past 30 days, frequency of consuming five or more drinks on one occasion, previous alcohol use, lifetime use of marijuana use, frequency of marijuana use in the past 30 days, precocious marijuana use, lifetime use of cocaine in any form, [TABULAR DATA FOR TABLE 2 OMITTED] use of cocaine in any form the past 30 days, precocious cocaine use, use of crack or freebase cocaine, use of any other type of illegal drugs, and injecting any drug not prescribed by a physician.
Most of the men reported smoking 1.8 grams of freebase cocaine (a potent form of the drug) every day for two years, but researchers performed frequent urine tests during the study to make sure they remained cocaine-free.
He admitted to stealing three motorcycles and trading them for freebase cocaine, which he intended to use, the ISF said.
At the time of their arrest, they were reportedly carrying 32 small plastic bags of cocaine, 52 bags of freebase cocaine, four bags of marijuana and two bags of hashish, in additional to $1,150 and LL6.1 million ($4,000) in cash.
Dr Malcolm Banks used a makeshift laboratory at his Edinburgh home to transform a worthless, contaminated batch of the drug into freebase cocaine that could fetch pounds 85,000 on the streets.
He was caught with 17 grams of freebase cocaine and a gram of heroin on his person.