viscera (n.), visceral (adj.)

https://doi.org/10.1351/goldbook.11374

Soft and hollow organs of the body, in vertebrates particularly those found in the thoracic and abdominal cavities.

Note: This gives rise to the distinction of the visceral and parietal serous membranes, located closest to the organ or to the body wall, respectively. For examples, see pericardium, peritoneal cavity and pleura.

Source:
PAC, 2016, 88, 713. 'Glossary of terms used in developmental and reproductive toxicology (IUPAC Recommendations 2016)' on page 820 (https://doi.org/10.1515/pac-2015-1202)