ثَاءٌ
1.
The name of the letter
ث, q. v.; as also ثَا: plural [of the former,] ثَاءَاتٌ; and [of the latter,] أَثْوَاءٌ and أَثْيَاءٌ. (TA in باب الالف الليّنة.)
2.
It also stands for ثَنَاءٌ, and ثَوَابٌ, and the like. (Idem ubi suprà.)
3.
Also The best of anything; as, for instance, of wheat, and of flesh-meat, and of sugar. (Kh, TA ubi suprà.)