Source : Webster's Revised Unabridged Dictionary (1913)

Bird pepper \Bird" pep`per\
   A species of capsicum ({Capsicum baccatum}), whose small,
   conical, coral-red fruit is among the most piquant of all red
   peppers.

Source : WordNet®

bird pepper
     n : plant bearing very small and very hot oblong red fruits;
         includes wild forms native to tropical America; thought
         to be ancestral to the sweet pepper and many hot peppers
         [syn: {Capsicum frutescens baccatum}, {Capsicum baccatum}]