triceps
/ˈtraɪseps/noun
(复同单)
- Anatomy any of several muscles having three points of attachment at one end, particularly (also triceps brachii /ˈbreɪkɪaɪ/) the large muscle at the back of the upper arm【剖】（尤指上臂背部的）三头肌。
词源
late 16th cent.: from Latin, literally 'three-headed', from tri- 'three' + -ceps （from caput 'head'）.