The Collaborative International Dictionary of English v.0.48:

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.
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   2. A very small quantity or value. [Obs.]
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            In her cup was no farthing seen of grease.
                                                  --Chaucer.
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   3. A division of land. [Obs.]
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            Thirty acres make a farthing land; nine farthings a
            Cornish acre; and four Cornish acres a knight's fee.
                                                  --R. Carew.
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WordNet (r) 3.0 (2006):

farthing
    n 1: a former British bronze coin worth a quarter of a penny