The definition of marijuana is the leaves of a cannabis plant that are used as a drug that can be smoked or consumed in order to create a feeling of being euphoric or "high."(noun)
An example of marijuana is the leaves of a plant that people roll up into the form of a cigarette in order to smoke and get high.
See marijuana in Webster's New World College Dictionary
☆ or marihuana
Origin: AmSp marihuana, mariguana < ? native word blended with pers. name María Juana, Mary Jane
See marijuana in American Heritage Dictionary 4
Origin: Spanish marihuana.
Learn more about marijuana