The tender fresh parts of Catha edulis.
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khat also kat or qat or quat 'kät n a shrub (Catha edulis) cultivated in the Middle East and Africa for its leaves and buds that are the source of a habituating stimulant when chewed or used as a tea
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n.
the leaves of the shrub Catha edulis, which contain a stimulant. In Yemen these leaves are wrapped around betel nuts and chewed: this habit is associated with the development of oral leukoplakia.
Medical dictionary. 2011.