n. One who adapts, or makes an adaptation; specifically, one who translates, remodels, or rearranges a composition or work, rendering it fit to be represented on the stage, as a play from a foreign tongue or from a novel.n. That which adapts; anything that serves the purpose of adapting or adjusting one thing to another. Specificallyn. In chem., a receiver with two necks diametrically opposite, one of which admits the neck of a retort, while the other is joined to a second receiver.n. In optics: A metal ring uniting two lengths of a telescope.n. An attachment to a microscope for centering the illuminating apparatus or throwing it out of center. E. H. Knight.n. A means for enabling object-glasses made by different makers, and having different screws, to be fitted to a body not specially adapted to receive them.n. A glass or rubber tube, with ends differing in size, used to connect two other tubes or two pieces of apparatus.n. In photography, an attachment to a camera by means of which plates of sizes other than those for which the camera is designed may be used.