conduro
con-dūro, āre,
- v. a., to harden, to make very hard: ferrum, Lucr. 6, 969.
con-dūro, āre, erhärten, ferrum, Lucr. 6, 968: lac, Cassiod. var. 12, 12, 2.
condūrō, (16) āre, tr., rendre très dur : Lucr. 6, 968.