1. A fully differentiated structural and functional unit in an animal that is specialized for some particular function Noun
2. A government agency or instrument devoted to the performance of some specific function Noun
3. (music) an electronic simulation of a pipe organ Noun
4. A periodical that is published by a special interest group Noun
5. Wind instrument whose sound is produced by means of pipes arranged in sets supplied with air from a bellows and controlled from a large complex musical keyboard Noun
6. A free-reeded instrument with a piano keyboard in which air is forced through the reeds by bellows Noun