ثَلَاثُونَ
Root: ثلث
Full Definition
ثَلَاثُونَ
, [also written ثَلٰثُونَ,] the noun of number, [meaning Thirty, and also thirtieth,] is not considered as a multiple of ثَلَاثَةٌ, but as a multiple of عَشَرَةٌ; and therefore, if you name a man ثَلَاثُونَ, you do not make the dim. to be ثَلِيِّثُون, but [you assimilate the noun from which it is formed to a pl. with و and ن from عَشَرَةٌ, or to عِشْرُونَ, and say]
ثُلَيْثُونَ .
Lane's Lexicon
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Hans Wehr
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Mufradat
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