khat Syllabification: (khat)Pronunciation: /kät/ (also qat)Definition of khat noun 1the 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 ḳātkhat in other Oxford dictionaries Definition of khat in the British & World English dictionary