1. A thin, smooth serous membrane investing the internal surface of the abdomen, and more or less completely all the viscera contained in it.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• peritonium,
• peritonela,
• peridonium,
• peridinum,
• peritinium,
• oeritoneum,
• leritoneum,
• -eritoneum,
• 0eritoneum,
• pwritoneum,
• psritoneum,
• pdritoneum,
• prritoneum,
• petitoneum,
• peritineum,
• peritoneyum,
• peritonneum,
• paritoneum,
• peritonaum,
• Peritonieum

• peridium,
• peridinium,
• peritonitis,
• peritoneal.

The adjective form of the word "peritoneum" is "peritoneal".