pericardium
nounUK /ˌperɪˈkɑːdiəm/
US /ˌperɪˈkɑːrdiəm/
The thin bag around your heart that keeps it safe.
The doctor said the fluid inside the pericardium helps protect the heart.
OTHER MEANINGS
2. The membrane that encloses the heart in vertebrates.
In anatomy class we learned that the pericardium has two layers.
3. A protective sheath surrounding a bodily organ.
Some worms have a pericardium around their hearts.
4. The cavity or space formed by this membrane.
Blood can collect in the pericardium after an injury.