Rubaiyat stanza
noun
Ru·bai·yat stanza ˈrü-bē-ˌät- 
-ˌbī-,
-ˌat-
: an iambic pentameter quatrain with a rhyme scheme aaba
Word History
Etymology
The Rubáiyát of Omar Khayyám, quatrains translated by Edward FitzGerald (1859)
First Known Use
1940, in the meaning defined above