/mar'euh wah"neuh/ , n.
1. hemp (def. 1).
2. the dried leaves and female flowers of the hemp plant, used in cigarette form as a narcotic or hallucinogen.
Also, marihuana .
[ 1890-95, Amer.; marihuana, mariguana; traditional assoc. with the personal name María Juana is prob. a folk etym. ]