Definition of organ-pipe:
(n) :
The larger part of an organism, composed of tissues that perform similar functions.
(n) :
(music) A musical instrument that has multiple pipes which play when a key is pressed (the pipe organ), or an electronic instrument designed to replicate such.
(n) :
(by extension) A body of an organization dedicated to the performing of certain functions.
(n) :
A government organization; agency; authority.
(n) :
An official magazine, newsletter, or similar publication of an organization.
(n) :
(slang) The penis.