Case"hard`ened (?), a. 1. Having the surface hardened, as iron tools.
2. Hardened against, or insusceptible to, good influences; rendered callous by persistence in wrongdoing or resistance of good influences; -- said of persons.
Case"hard`en*ing, n. The act or process of converting the surface of iron into steel. Ure.
&fist; Casehardening is now commonly effected by cementation with charcoal or other carbonizing material, the depth and degree of hardening (carbonization) depending on the time during which the iron is exposed to the heat. See Cementation.
Ca"se*ic (?), a. [Cf. F. casÚique, fr. L. caseus cheese.] Of or pertaining to cheese; as, caseic acid.
Ca"se*in (?), n. [Cf. F. casÚine, fr. L. caseur cheese. Cf. Cheese.] (Physiol. Chem.) A proteid substance present in both the animal and the vegetable kingdom. In the animal kingdom it is chiefly found in milk, and constitutes the main part of the curd separated by rennet; in the vegetable kingdom it is found more or less abundantly in the seeds of leguminous plants. Its reactions resemble those of alkali albumin. [Written also caseine.]
Case" knife` (?). 1. A knife carried in a sheath or case. Addison.