yas यस् cl. 4. P. ([Dhātup. xxvi, 101]) yásyati (rarely yasati cf. [Pāṇ. iii, 1, 71]; Impv. -yayastu, [RV.]; Gr. also pf. yayāsa; aor. ayasat; fut. yasitā, yasiṣyati; inf. yasitum; ind.p. yasitvā, or yastvā), to froth up, foam, [RV.] (cf. √ yeṣ); to heat or exert one's self, [Car.]; to strive after (dat.), [Kāvyād. ii, 83] (v.l.) : Caus. yāsayati (aor. ayīyasat) Gr.: Desid. yiyasiṣati, [ib.] : Intens. yāyasyate, yāyasti, [ib.] [Cf. Gk. ζέω &c.] yaska यस्क m. N. of a man (pl. his descendants and a partic. school; cf. yāska), [Kāṭh.]; [ĀśvŚr.] (cf. [Pāṇ. ii, 4, 63]). yasta यस्त mfn. entrusted, deposited, [L.] (cf. ā-, pray° &c.) yasya यस्य mfn. to be endeavoured &c. to be killed (-tva n.), [Bhaṭṭ.] yasmāt यस्मात् ind. (abl. of 3. ya, correlative of tasmāt, tatas, tad &c.) from which, from which cause, since, as, because, [Mn.]; [MBh.] &c. that, in order that, [R.] yasyatva यस्यत्व yasya—tva n.