òrgan

órgan is a noun used in Gaelic orthography to denote an organ, in both biological and musical senses. In biology, an organ is a structural unit made up of two or more tissue types that cooperate to perform one or more functions vital to an organism. Examples include the heart, liver, lungs, and kidneys. Organs are organized into organ systems, such as the circulatory, digestive, and nervous systems, and they vary widely in size and complexity among species. In plants, organs include roots, stems, leaves, and flowers, which coordinate to support growth, transport, and reproduction.

In music, an organ is a keyboard instrument that produces sound either by pipes supplied with wind or by electronic means. A pipe organ features a wind reservoir, a console with keyboards (manuals), a pedalboard, and a system of pipes or electronic stops that shape the tone. The instrument is central to many churches, concert halls, and educational settings, with variations such as mechanical action, electric action, and digital organs.

In medical and scientific contexts, organ health and function are assessed through imaging, laboratory tests, and functional studies. Organ transplantation and regenerative medicine address the replacement and repair of organs, raising ethical, logistical, and policy considerations.

See also: organ (disambiguation), anatomy, botany, music theory.