khatPronunciation: /kɑːt/ (also qat)Definition of khat noun 1 [mass noun] the leaves of an Arabian shrub, which are chewed (or drunk as an infusion) as a stimulant. 2the shrub that produces khat, growing in mountainous regions and often cultivated. Catha edulis, family Celastraceae Origin: mid 19th century: from Arabic qātkhat in other Oxford dictionaries Definition of khat in the US English dictionary