The Collaborative International Dictionary of English v.0.48:

Pyracanth \Pyr"a*canth\, n. [Gr. ? fire + ? a thorn, prickly
   plant.] (Bot.)
   The evergreen thorn (Crat[ae]gus Pyracantha), a shrub
   native of Europe.
   [1913 Webster]

WordNet (r) 3.0 (2006):

pyracanth
    n 1: any of various thorny shrubs of the genus Pyracantha
         bearing small white flowers followed by hard red or orange-
         red berries [syn: Pyracantha, pyracanth, fire thorn,
         firethorn]