Noun:

Sextant,

sextantal's Usage Examples:

The sextantal as, the denomination used by Livy to define the centuriate property thresholds.

about seventy years, and its weight had been reduced in several stages, a sextantal as was introduced (meaning that it weighed one-sixth of a pound).

libral/semi-libral standards were followed by the triental standards and the sextantal standard.

produced to a standard of about 55 grams; this was very quickly reduced to a sextantal standard and finally an uncial standard of roughly 32 gms.

Further reductions took place until the cast bronze gave way to struck sextantal bronze in about 214-212 BC, and the introduction of the silver 10-as denarius.