rel. n. of اِثْنَانِ, and of اِثْنَا عَشَرَ, when either or these is used as the proper name of a man; as also ↓اِثْنِىٌّ [with ا when connected with a preceding word]; like بِنَوِىٌّ and اِبْنِىٌّ as rel. ns. of اِبْنٌ. (S.)
2.
And الثَّنَوِيَّةُ [The Dualists;] the sect who assert the doctrine of Dualism [الاِثْنَيْنِيَّة]. (TA.)