Petra - What does it mean?
petra | |
stone, a weight equal to 14 pounds.
* 1882 , James Edwin Thorold Rogers, A History of Agriculture and Prices in England , Volume 4, p. 209:
petra
English
Noun
- Generally, however, the stone or petra, almost always of 14 lbs., is used, the tod of 28 lbs., and the sack of thirteen stone.