papillary muscle
/ˈpeɪpə ɹɪsˈaɪklɪŋ kəntˈeɪnə/
n
中文：乳头肌
Meaning：Internal ventricular muscle restraining the mitral or tricuspid valve and preventing it from being pushed back into the atrium during contraction of the ventricle.
中文：乳头肌