\begin{definition}[Definition:Roman Weights and Measures/Mass/Scrupulus]
The '''scrupulus''' is a unit of mass that was part of the Roman system of weights.
:$1$ '''scrupulus''' $= \dfrac 1 {24}$ uncia $= 8$ calci.
Its value in modern units is estimated to be approximately $17.6$ grains, or approximately $0.14$ grams.
\end{definition}