From Latin rōs, rōrem, possibly through a Vulgar Latin root *rovem through analogy with other words like bos, whence bovem. Another theory suggests an initial early Romanian form *roor, resulting in a plural *rouri which was reformed into a singular analogically. Compare also the change of Latin nos, whence noi, nouă, vos, whence voi, vouă, which may have influenced the result of rouă. The Latin word derives from Proto-Indo-European *Hroseh₂.
rouă f (uncountable)