دَيْمُومٌ
and دَيْمُومَةٌ
A wide [desert such as is termed] فَلَاة; (M, K, TA;) in which journeying continues long (يَدُومُ [for it is regarded by some as derived from دَامَ, of which دَيْمُومَةٌ is also a verbal noun,]) by reason of its far-extending: (TA:) or a [desert such as is termed] مَفَازَة
in which is no water: (S:) or a level tract of land in which are no signs of the way, nor any road, nor water, nor any one to cheer by his presence: plural دَيَامِيمُ: which is explained as signifying smooth deserts of which the extremities are far apart: and أَرْضٌ دَيْمُومَةٌ signifies a land that is disapproved, disliked, or abominable. (T in article دوم, and TA.)