farthing (n.) Look up farthing at Dictionary.com
Old English feorðung "quarter of a penny," a diminutive derivative of feorða "fourth" (from feower "four") + -ing "fractional part." Cognate with Old Frisian fiardeng, Middle Low German verdink, Old Norse fjordhungr.

Used in biblical translation of Latin quadrans "quarter of a denarius;" the English coin (of silver until 17c., later of copper or bronze), first was minted under Edward I and abolished 1961.
I shall geat a fart of a dead man as soone As a farthyng of him. [Heywood, "Proverbs," 1562]