tetralogy
/teˈtrælədʒɪ/noun
(pl.-ies)
1
- a group of four related literary or operatic works（文学作品、歌剧等的）四部曲。
1.1
- a series of four ancient Greek dramas, three tragic and one satyric, originally presented together（古希腊由三部悲剧与一部滑稽喜剧组成的）四联剧, 四部曲
- ORIGIN: from Greek tetralogia.
2
- Medicine a set of four related symptoms or abnormalities frequently occurring together【医】四联症。