Source : Webster's Revised Unabridged Dictionary (1913)

Pyracanth \Pyr"a*canth\, n. [Gr. ? fire + ? a thorn, prickly
   plant.] (Bot.)
   The evergreen thorn ({Crat[ae]gus Pyracantha}), a shrub
   native of Europe.

Source : WordNet®

pyracanth
     n : any of various thorny shrubs of the genus Pyracantha bearing
         small white flowers followed by hard red or orange-red
         berries [syn: {Pyracantha}, {fire thorn}, {firethorn}]