1) Church instrument parts 2) Pipe organ component 
An organ stop (or just stop) is a component of a pipe organ that admits pressurized air (known as wind) to a set of organ pipes. Its name comes from the fact that stops can be used selectively by the organist; some can be `on` (admitting the passage of air to certain pipes), while others can be `off` (stopping the passage of air to certain pip...
[n] - a graduated set of organ pipes of like tone quality
noun a graduated set of organ pipes of like tone quality