or·gan 
(ôrgən)
(ôrgən)n.
1. Music
a. An instrument consisting of a number of pipes that sound tones when supplied with air and a keyboard that operates a mechanism controlling the flow of air to the pipes. Also called pipe organ.
b. Any one of various other instruments, such as the electronic organ, that resemble a pipe organ either in mechanism or sound.
2. Biology A differentiated part of an organism, such as an eye, wing, or leaf, that performs a specific function.
3. An instrument or agency dedicated to the performance of specified functions: The FBI is an organ of the Justice Department.
4. An instrument or means of communication, especially a periodical issued by a political party, business firm, or other group.
[Middle English, from Old French organe and from Old English organe, both from Latin organum, tool, instrument, from Greek organon; see werg- in the Appendix of Indo-European roots.]
- decongest
- decongestant
- decongestion
- decongestive
- deconsecrate
- deconsecration
- deconstruct
- deconstruction
- deconstructionism
- deconstructionist
- deconstructive
- deconstructivism
- deconstructivist
- decontaminant
- decontaminate
- decontamination
- decontaminator
- decontrol
- decor
- decorate
- Decorated style
- decoration
- Decoration Day
- decorative
- decorative art