رَهَاءٌ
1.
A wide place. (K.)
2.
A wide tract of land: (S, TA:) or what is wide of land: (M, TA:) [or] an even tract of land, seldom free from the
سَرَاب [or mirage]: (JK, TA:) and what is even of anything. (TA.)
3.
See also رَهْوٌ, as applied to a woman.
4.
It is also [apparently A hue, or a haze,] like dust-colour and smoke. (TA.)