cocaine crack cocaine http://id.loc.gov/authorities/subjects/sh87000392 http://purl.bioontology.org/ontology/MESH/D016578 http://purl.obolibrary.org/obo/NCIT_C105553 https://en.wikipedia.org/wiki/Crack_cocaine https://www.wikidata.org/wiki/Q330694 HV5810 RC568.C6 The purified, alkaloidal, extra-potent form of cocaine. It is smoked (free-based), injected intravenously, and orally ingested. Use of crack results in alterations in function of the cardiovascular system, the autonomic nervous system, the central nervous system, and the gastrointestinal system. The slang term "crack" was derived from the crackling sound made upon igniting of this form of cocaine for smoking. crack rock