D defs.my
Entry 2 senses Webster, 1913

Free base

/(frē" bās`)/ · Free· base · IPA
01 n. The basic form of an organic amine which is capable of forming acid salts such as hydrochlorides.
  1. 1.
    The basic form of an organic amine which is capable of forming acid salts such as hydrochlorides.(Chem.)
  2. 2.
    The basic form of a drug, often more powerful than a salt form because it is more readily absorbed into the blood stream.