auripigmentum

εἶτα ὁ γνώμων μοί πως ἀνίσταται → then my tool suddenly stood up

Latin > English (Lewis & Short)

aurĭ-pigmentum: i, n. aurum,
I orpiment; composed of arsenic, sulphur, and earth, of a brilliant yellow color, Vitr. 7, 7; Cels. 5, 5; Plin. 33, 4, 22, § 79.

aurĭpigmentum, ī, n. (aurum, pigmentum), orpin, orpiment : Plin. 33, 79 ; Cels. Med. 5, 5 ; Vitr. Arch. 7, 7.