Scrupulum
Scrupulum, meaning a tiny stone, indicates a weight of of a Roman ounce or, by extension, of other measures. Metaphorically, the stone is thought to be sharp and pricking, like a thorn.
- As a weight or a coin, of an uncia, or of an as; i.e. 1.14 grams
- As a measure of land, of a jugerum; i.e. about
- As a measure of time, part of an hour, or minutes.