فَيْفٌ

A place that is even, level, or flat: (S, O, K:) or, (K,) according to Lth, (T, O,) a waterless desert, (T, M, O, K,) such as is even, level, or flat, and wide, or spacious; (T, O;) and ↓ فَيْفَاةٌ and ↓ فَيفَاءُ (M, K) and ↓ فَيْفَى (K) also signify [thus, or] a waterless desert: (M. K:) and, (K,) according to El-Mu-arrij, (T, O,) فَيْفٌ signifies a portion of the earth that is a place whereof the winds are variable; (T, O, K;) and this is the explanation that is preferred by Sh: (T:) and according to AA, it signifies [also] any road between two mountains: (T, TA:) its plural is أَفْيَافٌ [a plural of pauc.] and فُيُوفٌ [a plural of mult.]. (T, S, M, O, K.)