farthing

Concise Oxford English Dictionary © 2008 Oxford University Press:
farthing/ˈfɑːðɪŋ/

▶noun

• 1 a former monetary unit and coin of the UK, equal to a quarter of an old penny.

• 2 [usu. with neg.] the least possible amount.

– origin OE fēorthing, from fēortha ‘fourth’, perh. on the pattern of ON fjórthungr ‘quarter’.