octet
/ɒkˈtet/noun
1- a group of eight people or things, in particular八人一组; 八个一组, 尤指：
1.1
- a group of eight musicians八重唱（或八重奏）组合。
1.2
- a musical composition for eight voices or instruments八重唱（或八重奏）乐曲。
1.3
- the first eight lines of a sonnet（十四行诗的）前八行。
1.4
- Chemistry a stable group of eight electrons occupying a single shell in an atom【化】八隅（体）。
词源
mid 19th cent.: from Italian ottetto or German Oktett, on the pattern of duet and quartet.