any of a category of behavior-altering or addictive drugs, as heroin or cocaine, whose possession and use are restricted by law.
nootropicsRead more in this article about some frequently asked questions and fun facts related to our definitions.
What’s Wrong With The Word “Addict”?The word addict dates back to at least the 1500s, adapted from the Latin addictus, meaning "assigned, surrendered." But, if experts in drug addiction treatment have their way, use of the word addict as a noun will soon see its end date.
- controlled experiment,
- controlled explosion,
- controlled hypotension,
- controlled mechanical ventilation,
- controlled respiration,
- controlled ventilation,
- controlling image
Origin of controlled substance
First recorded in 1970–75
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
A drug or chemical substance whose possession and use are regulated under the Controlled Substances Act.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.