The Collaborative International Dictionary of English v.0.48:

Cocaine \Co"ca*ine\, n. (Chem.)
   A powerful narcotic alkaloid, C17H21NO4, obtained from the
   leaves of coca. It is a bitter, white, crystalline substance,
   and is remarkable for producing local insensibility to pain.
   It is classified as addictive and is not available in the U.
   S. without a prescription, but is nevertheless one of the
   most widespread illegal drugs of abuse. It is used in several
   forms, including small pellets of free base, called crack.
   Most of the cacaine illegally used in the U.S. is imported.
   [1913 Webster +PJC]

WordNet (r) 3.0 (2006):

cocaine
    n 1: a narcotic (alkaloid) extracted from coca leaves; used as a
         surface anesthetic or taken for pleasure; can become
         powerfully addictive [syn: cocaine, cocain]

Moby Thesaurus II by Grady Ward, 1.0:

23 Moby Thesaurus words for "cocaine":
   Benzedrine, Benzedrine pill, C, Dexamyl, Dexamyl pill, Dexedrine,
   Dexedrine pill, Methedrine, amphetamine, amphetamine sulfate, coke,
   crystal, dextroamphetamine sulfate, football, heart, jolly bean,
   methamphetamine hydrochloride, pep pill, purple heart, snow, speed,
   stimulant, upper