كثب

كَثِيبٌ ذ A thing collected together. (Msb.) ― -b2- A hill, or heap, of sand: (S, K:) or an oblong and gibbous hill of sand: or an extended gibbous hill [or an elevated expanse ] of sand: or what has collected, of sand, and assumed a gibbous shape: (TA:) or what has poured down, of sand, into a place, and collected there: (S:) [less than what is called عَقَنْقَلٌ, q. v.:] pl. كُثْبَانٌ (S, K) and كُثُبٌ and أَكْثِبَةٌ: (K:) [the last a pl. of pauc.]. ― -b3- وكَانَتِ الجِبَالُ كَثِيبًا مُهِيلًا [Kur, lxxiii. 14,] signifies And the mountains shall be sand, whereof the lower part being shaken, it shall pour down upon thee from above. (Fr.) ― -b4- ثَلَاثَةٌ عَلَى كُثُبِ المِسْكِ, or كُثْبَانِ المسك, [ Three (descriptions of men shall be, on the day of resurrection,) on hills, or heaps, of musk ]. (TA, from a trad.)