Altruism, al′trōō-ism, n. the principle of living and acting for the interest of others.—adj. Altruist′ic.—adv. Altruist′ically. [Fr. altruisme, formed by Comte from It. altrui—L. alter, another.]
Alum, al′um, n. a mineral salt, the double sulphate of alumina and potash, used as a mordant in dyeing and for many purposes.—adj. Al′umish, having the character or taste of alum.—ns. Al′um-shale, or -slate, a slate consisting mainly of clay, iron pyrites, and coaly matter, from which alum is obtained. [L. alumen.]
Alumina, al-ū′min-a, Alumine, al′ū-min, n. one of the earths, the characteristic ingredient of common clay—the oxide of aluminium.—adj. Alū′minous, containing alum or alumina. [L. alumen, alum.]
Aluminium, al-ū-min′i-um, n. the metallic base of alumina; a metal somewhat resembling silver, and remarkable for its lightness, now made from Bauxite.—Aluminium bronze, an alloy lighter than gold, but like it in colour. [First called Aluminum by the discoverer, Sir H. Davy (1778-1829).]
Alumnus, al-um′nus, n. one educated at a college is called an alumnus of it:—pl. Alum′ni.—n. Alum′niate, the period of pupilage. [L.,—alĕre, to nourish.]
Alunite, al′un-īt, n. a mineral consisting of common alum together with normal hydrate of aluminium.—Also Alum-stone, Alumin′ilite.
Alure, al-lūr′, n. (obs.) a place to walk in, a gallery, a covered passage. [O. Fr. aleure, aller, to go.]
Alveary, al′ve-ar-i, n. a beehive: (anat.) the hollow of the external ear.—adj. Al′veolate, pitted like a honeycomb. [L. alvearium, beehive—alveus, a hollow vessel.]
Alveolar, al′ve-o-lar, adj. (anat.) of or belonging to the sockets of the teeth, as the alveolar arch, the part of the upper jaw in which the teeth are placed—also Al′veolary.—n. Al′veole, the hollow or socket of a tooth—more common Alvē′olus.
Alvine, al′vin, adj. of or from the belly. [From L. alvus, belly.]