| long-term, pathological use of alcohol or drugs, characterized by daily intoxication, inability to reduce consumption, and impairment in social or occupational functioning; broadly, alcohol or drug addiction. |
| substance abuse n. The overindulgence in and dependence on an addictive substance, especially alcohol or a narcotic drug. Also called chemical abuse. substance abuser n. |
substance abuse n.
Excessive use of a potentially addictive substance, especially one that may modify body functions, such as alcohol and drugs. Also called chemical abuse.