Meaning of freebase

free•base

Pronunciation: (frē'bās"), [key]
— v., n. -based, -bas•ing,
—v.t.
  1. to purify (cocaine) by dissolving in ether, sodium hydroxide, etc., and filtering off the precipitate.
  2. to ingest (freebased cocaine).
—v.i.
  1. to freebase cocaine.
—n.
  1. freebased cocaine.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.