Definition:Apothecaries' Weights and Measures/Mass/Scruple/Historical Note

Historical Note on Scruple
The scruple was defined to be the $\dfrac 1 {24}$ part of the Roman uncia, better known in modern times as the ounce.

It survives in the modern age as a unit of the apothecaries' scale whose ounce is approximately $1.1$ ounce avoirdupois.