اسنتوا

They experienced drought, or barrenness: (S, M, A, K:) derived from سَنَةٌ; the و being changed into ت, [for سَنَةٌ is originally سَنْوَةٌ, or, according to one dialect سَنْهَةٌ,] to distinguish between this verb and أَسْنَى as signifying “ he remained in a place a year: ” or, as Fr says, they imagined the ه [meaning ة, in سَنَةٌ,] to be a radical letter, finding it to be the third letter, and therefore changed it into ت: (S:) according to Sb, the ت [in أَسْنَتَ] is substituted for the ى [in أَسْنَى]; and there is no instance of the like except ثِنْتَانِ [in which the ت is substituted for the final radical, ى], (M in the present article,) and in words of the measure اِفْتَعَلَ [as اِتَّسَرَ for اِيتَسَرَ]. (M in article ثنى.)