marijuana UK /ˌmæɹɪˈwɑː.nə/US /ˌmɛɹɪˈwɑ.nə/ noun2 •the dried flowers of the cannabis plant, smoked or eaten for the effect they have on the mindAfter smoking a bowl of that fine marijuana, they ate some brownies. •The hemp plant itself, Cannabis sativa. formsmarijuanas