The English word "organ" dates back to the twelfth century, in reference to any musical instrument.
By the late 14th century, the musical term's meaning had narrowed to refer specifically to the keyboard-based instrument.
At the same time, a second meaning arose, in reference to a "body part adapted to a certain function".

Plant organs are made from tissue composed of different types of tissue.
The three tissue types are ground, vascular, and dermal.
When three or more organs are present, it is called an organ system.

The adjective visceral, also splanchnic, is used for anything pertaining to the internal organs.
Historically, viscera of animals were examined by Roman pagan priests like the haruspices or the augurs in order to divine the future by their shape, dimensions or other factors.
This practice remains an important ritual in some remote, tribal societies.

The term "visceral" is contrasted with the term "parietal", meaning "of or relating to the wall of a body part, organ or cavity" The two terms are often used in describing a membrane or piece of connective tissue, referring to the opposing sides.
The English word "organ" dates back to the twelfth century, in reference to any musical instrument. By the late 14th century, the musical term's meaning had narrowed to refer specifically to the keyboard-based instrument. At the same time, a second meaning arose, in reference to a "body part adapted to a certain function".
Plant organs are made from tissue composed of different types of tissue. The three tissue types are ground, vascular, and dermal. When three or more organs are present, it is called an organ system.
The adjective visceral, also splanchnic, is used for anything pertaining to the internal organs. Historically, viscera of animals were examined by Roman pagan priests like the haruspices or the augurs in order to divine the future by their shape, dimensions or other factors. This practice remains an important ritual in some remote, tribal societies.
The term "visceral" is contrasted with the term "parietal", meaning "of or relating to the wall of a body part, organ or cavity" The two terms are often used in describing a membrane or piece of connective tissue, referring to the opposing sides.
Organ (anatomy)