Anatomical term for a hollow space within the body, such as the thoracic or abdominal cavity.
The heart and lungs are contained in the thoracic cavity.
nasal cavity
thoracic cavity; chest cavity
body cavity; coelom
lumen; cavity
The kanji 腔 is composed of 肉 (flesh) and 空 (empty), suggesting a hollow space within the body. The reading こう is the on'yomi.