Definition:Roman Weights and Measures/Mass/Uncia

Definition
The uncia is a unit of mass that was part of the Roman system of weights.
 * $1$ uncia $= \dfrac 1 {12}$ libra $= 24$ scrupuli.

Its value in modern units is estimated to be approximately $423$ grains or $27.4$ grams.

Also see

 * Definition:Ounce
 * Definition:Ounce Avoirdupois
 * Definition:Apothecaries' Ounce
 * Definition:Troy Ounce