Source : Webster's Revised Unabridged Dictionary (1913)

Farthing \Far"thing\, n. [OE. furthing, AS. fe['o]r[eth]ung, fr.
   fe['o]r[eth]a fourth, fe['o]r, fe['o]wer, four. See {Four}.]
   1. The fourth of a penny; a small copper coin of Great
      Britain, being a cent in United States currency.

   2. A very small quantity or value. [Obs.]

            In her cup was no farthing seen of grease.
                                                  --Chaucer.

   3. A division of land. [Obs.]

            Thirty acres make a farthing land; nine farthings a
            Cornish acre; and four Cornish acres a knight's fee.
                                                  --R. Carew.

Source : WordNet®

farthing
     n : a former British bronze coin worth a quarter of a penny