hemp ( def 1 ).
the dried leaves and female flowers of the hemp plant, used in cigarette form as a narcotic or hallucinogen.
Also, marihuana.

1890–95, Americanism; < Mexican Spanish marihuana, mariguana; traditional association with the personal name María Juana is probably a folk etymology Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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World English Dictionary
marijuana or marihuana (ˌmærɪˈhwɑːnə)
1.  See also cannabis the dried leaves and flowers of the hemp plant, used for its euphoric effects, esp in the form of cigarettes
2.  another name for hemp
[C19: from Mexican Spanish]
marihuana or marihuana
[C19: from Mexican Spanish]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1918, alt. by influence of Sp. proper name Maria Juana "Mary Jane" from mariguan (1894), from Mex.Sp. marihuana, of uncertain origin.
"Marijuana ... makes you sensitive. Courtesy has a great deal to do with being sensitive. Unfortunately marijuana makes you the kind of sensitive where you insist on everyone listening to the drum solo in Iron Butterfly's 'In-a-Gadda-Da-Vida' fifty or sixty times." [P.J. O'Rourke, "Modern Manners," 1983]
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

marijuana mar·i·jua·na or mar·i·hua·na (mār'ə-wä'nə)

  1. The cannabis plant.

  2. A preparation made from the dried flower clusters and leaves of the cannabis plant, usually smoked or eaten to induce euphoria.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences for marijuana
Notably, marijuana use causes the eyes to turn red temporarily.
He confessed to marijuana use but claimed he did not use hard drugs.
Blunt cigar paper is also used to roll marijuana, after the tobacco is
The missing tobacco is replaced with marijuana or hashish, and rerolled.
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