Pronunciation: (fôr'pen"ē, -pu-nē, fōr'-), [key]
a. noting a nail 1½ in. (3.8 cm) long.
b. noting certain fine nails 13/8 in. (3.5 cm) long. Symbol: 4d
2. Brit.of the amount or value of fourpence.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.