organ

noun

• 1 Biology a part of an organism that is typically self-contained and has a specific vital function, such as the heart or liver in humans.
• a department or organization that performs a specified function:the central organs of administration and business
• a medium of communication, especially a newspaper or periodical that serves a particular organization, political party, etc.:an article in the official organ of the Salvation Army
• (used euphemistically) the penis.
• archaic a region of the brain formerly held to be the seat of a particular faculty.

• 2 (also pipe organ) a large musical instrument having rows of tuned pipes sounded by compressed air, and played using one or more keyboards to produce a wide range of musical effects. The pipes are generally arranged in ranks of a particular type, each controlled by a stop, and often into larger sets linked to separate keyboards.
• an electronic keyboard instrument that produces sounds similar to those of a pipe organ. See also reed organ.