COLLOID

adj. and n. KoToid. Gr., KoAAcoJij? (from xoAAa, glue, and elfios, resemblance). Lat., coHodes (adj.), colloideus (adj.), colloideum (n.). Fr., collo'ide. Ger., leimartig (adj.), Kolloid (n.). It., colloide. Sp., coloideo. 1. (Adj.) glue-like (see C. CANCER). 2. (Adj.) of Oppolzer and Schraut, see AMYLOID. 3. (N.) a glue-like substance; in pathology, a liquid or jelly-like material, distinguished from albumin by its insolubility in acetic acid, from mucus by the extent of its coagulability with acetic acid, and from lardaceous substance by its failing to respond to the iodine color test. [A, 291.] 4. (N.) of Graham, any substance which diffuses slowly through a neighboring liquid. The c's are usually organic bodies of complex chemical constitution. [B, 121 (a, 24).] Acrylic c's. Gelatinous bodies formed as by-products in the preparation of the bromacrylic acids. Empirical formula: CH4O3. They are apparently related to vegetable mucilage. [B, 2. J Anodyne c. See AMYL c. Carbolic c. A c. prepared by di olving 20 grains of carbolic acid in an ounce of styptic c. Iodized c. A solution of 20 grains of iodine in 1 oz. of collodium stypticum. Liquid c. A c. which, although ordinarily of gelatinous consistence, becomes liquid by particular methods of preparation, the substances which a isted in this transformation being removed by dialysis. An example is liquid silicic acid. [B, 6.] Styptic c. See COLLODIUM stypticum. Zinc c. A solution of 20 grains of zinc sulphate in 1 oz. of collodium stypticum. [E, 13.] [s. 348]