رَهْوَانٌ

A depressed piece of land or ground. (TA.)

And applied to A بِرْذَون [or horse for ordinary use and for journeying] that has an easy back in going along: a genuine Arabic word: (TA:) or رَهَوَانٌ [thus I find it written, but it is commonly pronounced رَهْوَان, or رَحْوَان with ح,] is a vulgar term applied to a pacing horse. (MF voce هِمْلَاجٌ.)