Noun.
Technical
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A
tall annual dioecious plant (Cannabis sativa), native to central Asia and having alternate, palmately divided leaves and tough bast fibers.
Any of several mildly euphoriant, intoxicating hallucinogenic
drugs, such as ganja, hashish, or
marijuana, prepared from various parts of this plant.
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Common
A type of "weed", that is good for you contrary to belief. But like anything else, anything excedding normal moderation can be bad.