harden Copy link Outline A. Trans.I. Lit.1. dūro, 12. indūro, 13. expr. by circuml. (aliquid) durius facere, reddereII. Fig.1. dūro, 12. indūro, 1B. Intrans.1. dūesco, dūrui, 32. indūresco, 33. obdūresco, 3 (more freq. in fig. sense) • harden: A. Trans.: I. Lit.: to make hard: 1. dūro, 1: to h. the hoofs (of a mule), ungulas d.: Col. 6, 37, fin.: Plin.: esp. in p. part.: snows h.'d on the ground, duratae solo nives, Hor.: Liv. 2. indūro, 1: the North wind h.s the snow, nivem ind. Boreas, Ov. Tr. 3, 10, 14: to become h.'d, indurari, Plin. 31, 2, 8. 3. expr. by circuml. (aliquid) durius facere, reddere: v. to make. II. Fig.: to render hardy or callous: 1. dūro, 1: to h. the limbs, the mind, membra, animum d., Hor. S. 1, 4, 119: to h. an army by endurance of danger, patientia periculorum exercitum d., Vell. 2, 78: h.'d to every crime, ad omne scelus duratus, Tac. 2. indūro, 1: to h. the mind, animum ind., Sen. Ep. 51, 5. To become h.'d, obdurescere (to become callous, insensible): I have become quite h.'d to that, jam ad ista obduruimus, Cic. Att. 13, 2: also indurescere (to become confirmed), Quint. 1, 3, 12. B. Intrans.: to become hard: 1. dūesco, dūrui, 3: water h.s (in freezing), d. humor, Cic. N. D. 2, 10, 26: Virg.: Tac. 2. indūresco, 3: before the grains of corn quite h., ante quam ex toto grana indurescant, Col. 2, 21, init. 3. obdūresco, 3 (more freq. in fig. sense): Cato: Varr. See also to congeal, curdle.