humerus
noun [ C ] anatomy specialized uk/ˈhjuː.mə.rəs/ us/ˈhjuː.mə.rəs/ humeri /ˈhjuː.mə.raɪ/ /ˈhjuː.mə.raɪ/
（人体大臂的）肱骨
the long bone in the upper half of your arm, between your shoulder and your elbow (= the middle part of the arm where it bends)