ثلث

ثُلَاثِىٌّ ثلاث ثلاثى ثلاثي a rel. n. from ثَلَاثَةٌ, anomalously formed, (M,) [or regularly formed from ثُلَاثَةٌ,] Of, or relating to, three things. (T, TA.) ― -b2- Three cubits in length, or height; applied in this sense to a garment, or piece of cloth; (T, A;) and to a boy. (T.) ― -b3- A word comprising, or composed of, three letters [ radical only, or of three radical letters with one or more augmentative; i. e., of three radical letters with, or without, an augment ]. (T, TA.)