كَاحٌ

and ↓ كِيحٌ The foot, or base, (عُرْض,) of a mountain: (S, K:) [or] its face, or part facing the spectator, above its foot, or base; synonym سَنَدُ جَبَلٍ: (S:) or its foot, or base, (عرض) and most rugged part: or its سَفْح [i. q. عُرْض]; and the foot, or base, of its face; synonym سَفْحُ سَنَدِهِ: or كِيحٌ signifies the side (نَاحِيَة) of a mountain: and any rugged face of a mountain, above its foot, or base: and in some cases, the side of a valley, when it is rugged, but not unless consisting of the hardest and roughest of stones: (As, TA:) plural of كَاحٌ, أَكْوَاحٌ; (M;) and (of ↓ كِيحٌ, TA,) أَكْيَاحٌ and كْيُوحٌ (K) and كِيَحَةٌ. (As, T.)

أَكْيَحُ ↓ كِيحٌ A rough or rugged [foot, or base, or face above the foot or base, &c., of a mountain]; an expression similar to يَوْمٌ أَيْوَمُ; (K, article كيح;) the latter word being a corroborative; for the سَنَد of a mountain is called كيح only because of its ruggedness and roughness. (TA.)