| absorptiometer [ǝb´sȯrp·tē`ä·mǝd·ǝr] ANALYTICAL CHEMISTRY 1. An instrument equipped with a filter system or other simple dispersing system to measure the absorption of nearly monochromatic radiation in the visible range by a gas or a liquid, and so determine the concentration of the absorbing constituents in the gas or liquid. 2. A device for regulating the thickness of a liquid in spectrophotometry. |