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narcotic

Introduction

narcotic, any of a number of substances that have a depressant effect on the nervous system. The chief narcotic drugs are opium , its constituents morphine and codeine , and the morphine derivative heroin .

See also drug addiction and drug abuse .

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The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2012, Columbia University Press. All rights reserved.

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The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2012, Columbia University Press. All rights reserved.