Source : Webster's Revised Unabridged Dictionary (1913)

Fourpence \Four"pence\, n.
   1. A British silver coin, worth four pence; a groat.

   2. A name formerly given in New England to the Spanish half
      real, a silver coin worth six and a quarter cents.

Source : WordNet®

fourpence
     n : a former English silver coin worth four pennies [syn: {groat}]