• synonyms


or free-base

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verb (used with object), free·based, free·bas·ing.
  1. to purify (cocaine) by dissolving in ether, sodium hydroxide, etc., and filtering off the precipitate.
  2. to ingest (freebased cocaine).
verb (used without object), free·based, free·bas·ing.
  1. to freebase cocaine.
  1. freebased cocaine.

Origin of freebase

First recorded in 1975–80; free + base1
Related formsfree·bas·er, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for freebase

Contemporary Examples

Historical Examples

  • Preparation of freebase, which involves the use of volatile solvents, can result in death or injury from fire or explosion.

    What Works: Schools Without Drugs

    United States Department of Education

  • Crack or freebase rock is extremely addictive, and its effects are felt within 10 seconds.

    What Works: Schools Without Drugs

    United States Department of Education

British Dictionary definitions for freebase


  1. slang cocaine that has been refined by heating it in ether or some other solvent
verb freebases, freebasing or freebased
  1. to refine (cocaine) in this way
  2. to smoke or inhale the fumes from (refined cocaine)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for freebase

1980 (noun and verb), in reference to cocaine. As a chemical process, it returns a salt form of an alkaloid to its pure form. Related: Freebased; freebasing.

Online Etymology Dictionary, © 2010 Douglas Harper