"quatrains" (in Persian poetry), 1859, plural of rubai, from Arabic rubaiyah, from rubaiy "composed of four elements."
Online Etymology Dictionary, © 2010 Douglas Harper
Examples from the Web for rubaiyat
The Persian kitten, who is chasing her tail, has been celebrated in Rubaiyat.The Librarian at Play
Edmund Lester Pearson
The Rubaiyat of Omar Khayyam is often parodied, but rarely worthily.A Parody Anthology
The 'Rubaiyat' 's the only poem—if you're going to quote poetry.
He had read the "Rubaiyat," and it made a great impression on him.
I am sorry that so many people know Fitzgerald only because of the "Rubaiyat."