Definition of "fipenny"

On the Ash Wednesday, when we had holiday from school, I trotted into Town on my own and walked into the Old Bank and plonked down on the counter twenty-one Guernsey shillings in pennies and halfpennies and fippennies and francs.

1974, GB Edwards, The Book of Ebenezer Le Page, New York, published 2007, page 13