compound /kom′pound/ [L, componere, to assemble] , 1. n., (in chemistry) a substance composed of two or more different elements, chemically combined in definite proportions, that cannot be separated by physical means. 2. n., any substance composed of two or more different ingredients. 3. adj., denoting an injury characterized by multiple factors, such as a compound fracture. 4. v., to make a substance by combining ingredients, such as a pharmaceutic.
