-cogenerator-

n. [ L. ] 1. One who, or that which, generates, begets, causes, or produces. [ 1913 Webster ]

2. An apparatus in which vapor or gas is formed from a liquid or solid by means of heat or chemical process, as a steam boiler, gas retort, or vessel for generating carbonic acid gas, etc. [ 1913 Webster ]

3. (Mus.) The principal sound or sounds by which others are produced; the fundamental note or root of the common chord; -- called also generating tone. [ 1913 Webster ]

4. (Elec.) Any machine that transforms mechanical into electrical energy; a dynamo. [ Webster 1913 Suppl. ]

5. (Math.) a mathematical entity which, when subjected to an operation, yields another mathematical entity; also, a generatrix. [ PJC ]