ALVEOLUS

(Lat.), n. m. A?l(a?1)-ve(wa)'o-lu?s(luts). Dim. of alveus, a hollow. Fr., alvéole (Ist and 2d def’s), Ger., Alveole, Zahnhôhle (1st def.), Endtasche (2d def.). It., alveolo. Sp.,alvéolo. 1. The bony socket of a tooth. [L.] 2. A pulmonary air-cell (a hemispherical saccule on the wall of an infundibulum or of a respiratory, or lobular, bronchial tube). {J, 30.] 3. A small communicating compartment in a iymphatic gland, formed by the trabecular framework and filled with adenoid ti ue. [C; J, 30.] 4 A shallow polygonal pit or rece , like those found eepecially on the mucous surface of the gall-bladder, the vesiculæ semina les, and the stomach, formed by the intersection of low ridges. [J, 30.] 5. The terminal lobule of a racemose gland. [J.] See also Acınvs. 6. In zodlogy, a sheath-like cavity, such as that in which, in the belemnite, the pro-ostracum was lodged. [A,359.] 7. In botany, see ALVEOLA—A. laryugeus. See SaccuLvs laryngis.—A. pulmoneus. A pulmonary air-cell. [J.]—Isrenchiala. See Parietal a,—Mucous alveoli of the, salivary glands. Those which secrete the ropy material of the saliva containing mucin. [C.]—Parietal a. An air-cell in the wall of an alveolar pa age in the lung. [J.]—Serous alveoli of the salivary glands. Those which seerete the serum albumin of the saliva, which coagulates on being heated. {Langley (C).]—Terminal a. An air-cell connected with à pulmonary infundibulum. {J.]