ثلث

مُثَلِّثٌ مثلث A calumniator, or slanderer, of his brother [or fellow ] to his prince; because he destroys three; namely, himself and his brother and his prince: (Sh, T, M, * K:) as also ↓ مُثْلِثٌ; (K;) or thus accord. to Aboo-'Owáneh. (Sh, T.) ― -b2- See also ثِلْثٌ, last sentence: ― -b3- and see ثَلُوثٌ.