episternum [ˌɛpɪˈstəːnəm] (pl. episternums 或 episterna -nə)
(Zoology)a bone between the clavicles, especially (in mammals) the upper part of the sternum (动)上胸骨 ■(Entomology)(in insects) the anterior part of the side wall of a thoracic segment (昆)(昆虫的)前侧片