<p><strong>Noun:</strong></p><ul><li>Also called pipe organ.</li><li>a musical instrument consisting of one or more sets of pipes sounded by means of compressed air, played by means of one or more keyboards, and capable of producing a wide range of musical effects.</li><li>any of various similar instruments, as a reed organ or an electronic organ.</li><li>a barrel organ or hand organ.</li><li>Biology: a grouping of tissues into a distinct structure, as a heart or kidney in animals or a leaf or stamen in plants, that performs a specialized task.</li><li>penis.</li><li>a newspaper, magazine, or other means of communicating information, thoughts, or opinions, especially in behalf of some organization, political group, or the like.</li><li>an instrument or means, as of action or performance: This committee will be the chief organ of administration.</li><li>Archaic: any of various musical instruments, especially wind instruments.</li></ul>