M / mĕsŏlăbĭum
noun greek

mĕsŏlăbĭum

gen. mĕsŏlăbii · gender neuter · decl. 2nd
= μεσολάβιον
a mathematical instrument for finding mean proportional lines, a mesolabe
a mathematical instrument for finding mean proportional lines, a mesolabe, Vitr. 9, 3, 14.