1. • noun - a fully differentiated structural and functional unit in an animal that is specialized for some particular function
   • noun - a government agency or instrument devoted to the performance of some specific function
   • noun - (music) an electronic simulation of a pipe organ
   • noun - a periodical that is published by a special interest group
   • noun - 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 - a free-reed instrument in which air is forced through the reeds by bellows
2. • Music.
   • 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.
   • Any one of various other instruments, such as the electronic organ, that resemble a pipe organ either in mechanism or sound.
   • A differentiated part of an organism, such as an eye, a wing, or a leaf, that performs a specific function.
   • An instrument or agency dedicated to the performance of specified functions: The FBI is an organ of the Justice Department.
   • An instrument or a means of communication, especially a periodical issued by a political party, business firm, or other group.
3. • n - a differentiated part of an organism performing a specific function

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