Also called pipe organ. 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.

any of various similar instruments, as a reed organ or an electronic organ.

a barrel organ or hand organ.

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.

penis

a newspaper, magazine, or other means of communicating information, thoughts, or opinions, esp. in behalf of some organization, political group, or the like.

an instrument or means, as of action or performance

This committee will be the chief organ of administration.

Archaic . any of various musical instruments, esp. wind, instruments.

noun

agency , agent , channel , device , element , forum , implement , instrument , journal , magazine , medium , member , ministry , mouthpiece , newspaper , paper , part , periodical , process , publication , review , structure , unit , vehicle , voice , way , arm , department , division , wing , instrumentality , instrumentation , intermediary , mechanism , console , entrails , innards , means , melodeon , offal , tool , viscera