I.a hardening in concreto.
I. Lit., a hardened, i. e. ligneous vine-branch, Col. 4, 21, 1; Plin. 17, 23, 35, § 208; Pall. Febr. 12, 1.—Called also duramen, Col. 4, 22, 1.—
II. Transf., a means of hardening, stimulus: “humanae imbecillitatis efficacissimum duramentum est necessitas,” Val. Max. 2, 7, 10.—
III. Trop., firmness (with robur), Sen. Tranq. An. 1.