- a bronze coin of ancient Rome, the 12th part of an as.
- (in prescriptions) an ounce of weight or volume.
Origin of uncia
1685–95; < Latin: a twelfth part, akin to ūnus one; cf. inch1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for unciae
Another way is to take two unciae of ore, a semi-uncia of litharge, two drachmae of Venetian glass and a semi-uncia of saltpetre.
These "thorns" are apparently fairly rich, four unciae to the centumpondium being equivalent to about 97 ozs.
The Romans commonly used fractions with denominator 12; these were described as unciae (ounces), being twelfths of the as (pound).