Organs are commonly observed as visibly distinct structures, but may also exist as loosely associated clusters of cells that work together to perform a specific function or functions.

CARO v1 does not include a generic 'organ' class, only simple and compound organ. CARO v2 may include organ, see https://github.com/obophenotype/caro/issues/4

uberon

anatomical unit, body organ, element

UBERON:0000062

• areolar connective tissue

• anatomical system

• visceral fat

• visceral serous membrane

• cortex

• organ part
• anatomical projection
• vasculature of organ