166. Final radical

Final radical s remains before a surd in general, and usually before s, as in çā́ssi, çāssva, āsse, āçī́ṣṣu (the last is also written āçī́ḥṣu: 172): but it is lost in ási (√as + si: 636). Before a sonant (that is, bh) in declension, it is treated as in external combination: thus, āçī́rbhis. Before a sonant (that is, dh) in conjugation, it appears to be dropped, at least after long ā: thus, çādhi, çaçādhi, cakādhi (the only quotable cases); in edhí (√as + dhi: 636) the root syllable is irregularly altered; but in 2d perss. pl., made with dhvam, as ādhvam, çādhvam, arādhvam (881 a), vadhvam (√vas

clothe), it is, on account of the equivalence and interchangeability of dhv and ddvh (232), impossible to say whether the s in omitted or converted into d.

a. Final radical s is very rare; RV. (twice, both 2d pers. sing.) treats ághas from √ghas in the same manner as any ordinary word ending in as.

b. For certain cases of irregular loss of the s of a root or tense-stem, see 233 b–e.