Source : Webster's Revised Unabridged Dictionary (1913)

Kat \Kat\, n. (Bot.)
   An Arabian shrub Catha edulis) the leaves of which are used
   as tea by the Arabs.

Source : WordNet®

kat
     n : the leaves of the shrub Catha edulis which are chewed like
         tobacco or used to make tea; has the effect of a euphoric
         stimulant; "in Yemen kat is used daily by 85% of adults"
         [syn: {khat}, {qat}, {quat}, {cat}, {Arabian tea}, {African
         tea}]