\begin{definition}[Definition:Roman Weights and Measures/Mass/Siliqua]
The '''siliqua''' is a unit of mass in the Roman system of weights.
:$1$ '''siliqua''' $= \dfrac 1 6$ scrupulus $= \dfrac 1 {144}$ uncia.
Its value in modern units is estimated to be approximately $2.9$ grains, or approximately $0.19$ grams.
Its modern equivalent is the carat.
\end{definition}