S / sācōma
noun greek

sācōma

gen. sācōmătis · gender neuter · decl. 3rd
a counterpoise; a weight precisely balancing something in the opposite scale; precisely
a counterpoise, a weight precisely balancing something in the opposite scale: pendet ex altera parte aequo pondere phelli sacoma saburrale, Vitr. 9, 8, 8.—Hence, ad sacoma appendĕre, precisely, exactly, Vitr. 9, praef. § 9.