serosa

/səˈroʊsə/
noun
  1. A smooth, thin membrane that lines certain internal body cavities and covers the organs inside them, such as the heart, lungs, and abdomen.
    • Inflammation of the serosa can cause sharp chest pain.
    • The serosa protects the organs by reducing friction as they move.
    • The surgeon carefully cut through the serosa to reach the stomach.
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