يَأَسٌ
Root: يأس
Full Definition
يَأَسٌ
Phthisis, or consumption; syn. سِلٌّ; because he who is affected by it is despaired of; or [because] the first who was affected by it was اليَأَسُ, or إِلْيَاس, the son of Mudar the son of Nizár: or, as Suh says, in the R, this disease was called دَآءُ يَاس, or دَآءُ إِلْيَاسَ, because الياس the son of Mudar died of it.