organ

An organ is a large wind keyboard musical instrument. (noun)

An example of organ is the instrument most often played in church.

An organ is a part of the body that has a specific function. (noun)

An example of a organ is the liver.

See organ in Webster's New World College Dictionary

noun

1. a large wind instrument consisting of various sets of pipes which, as they are opened by corresponding keys on one or more keyboards, allow passage to a column of compressed air that causes sound by vibration
2. any of several musical instruments producing similar or somewhat similar sounds
3. Archaic any musical instrument; esp., a wind instrument
in animals and plants, a part composed of specialized tissues and adapted to the performance of a specific function or functions
a means or instrument for the performance of some action: an organ of local government
a means of communicating ideas or opinions, as a periodical

See organ in American Heritage Dictionary 4

(ôrˈgən)

noun

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.
Biology A differentiated part of an organism, such as an eye, wing, or 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.