Definition of rubai in US English:

rubai

(also ruba'i, ruba'iy)

noun

  • In Persian poetry: a quatrain.

Origin

Late 18th century; earliest use found in New Asiatic Miscellany. From Persian rubāʿī and its etymon Arabic rubāʿī tetrastich, quatrain, use as noun of rubāʿī consisting of four, quadripartite, fourfold, quadruple from rubāʿ four at a time + -ī.

Pronunciation

rubai

/ruːˈbʌɪ/