arrūgĭa: ae, f. akin to runco, runcina, ὀρύσσω, ὀρύξω, to dig; cf. Corssen, Ausspr. I. p. 543; v. corrugus,I a shaft and pit in a gold-mine, Plin. 33, 4, 21, § 70.
arrugĭa, æ, f., galerie d’une mine d’or : Plin. 33, 70.