Source : Webster's Revised Unabridged Dictionary (1913)

Cayenne \Cay*enne\, n. [From Cayenne, a town and island in
   French Guiana, South America.]
   Cayenne pepper.

   {Cayenne pepper}.
   (a) (Bot.) A species of {Capsicum} ({C. frutescens}) with
       small and intensely pungent fruit.
   (b) A very pungent spice made by drying and grinding the
       fruits or seeds of several species of the genus
       {Capsicum}, esp. {C. annuum} and {C. Frutescens}; --
       called also {red pepper}. It is used chiefly as a
       condiment.

Source : WordNet®

cayenne
     n 1: plant bearing very hot and finely tapering long peppers;
          usually red [syn: {cayenne pepper}, {chili pepper}, {chilli
          pepper}, {long pepper}, {jalapeno}, {Capsicum annuum
          longum}]
     2: ground pods and seeds of pungent red peppers of the genus
        Capsicum [syn: {cayenne pepper}, {red pepper}]
     3: a long and often twisted hot red pepper [syn: {cayenne
        pepper}]