maxilla
/mækˈsɪlə/noun
(pl. maxillae / -liː/)
1- Anatomy & Zoology the jaw or jawbone, specifically the upper jaw in most vertebrates. In humans it also forms part of the nose and eye socket.【剖, 动】颌（骨）; 上颌（骨）。
1.1
- (in many arthropods) each of a pair of mouthparts used in chewing（节肢动物）下颚。
词源
late Middle English: from Latin, 'jaw'.