Organum (instrument)

An organum is any one of a number of musical instruments which were the forerunners of the organ.
The name comes from the Latin "organum", meaning any tool in general or any musical instrument in particular (or an organ of the body), which in turn came from the Greek "organon", with similar meanings, itself derived from "ergon" and so meaning something by which a task is accomplished. The name "organum" in turn gave rise to the modern everyday term "organ".