dioptra
From LSJ
τραχὺς ἐντεῦθεν μελάμπυγός τε τοῖς ἐχθροῖς ἅπασιν → he is a tough black-arse towards his enemies, he is a veritable Heracles towards his enemies
Latin > English (Lewis & Short)
dĭoptra: ae, f., = δίοπτρα,
I an optical instrument to measure the height of places, Vitr. 8, 6; for measuring the sun's shadow, Plin. 2, 69, 69, § 176.
Latin > French (Gaffiot 2016)
dĭoptra, æ, f. (δίοπτρα), instrument d’optique servant à prendre les hauteurs ou les distances : Vitr. Arch. 8, 5 || ou à mesurer l’ombre : Plin. 2, 176.
