209. The same retention

The same retention of original final s after a nasal, and consequent treatment of (apparent) final ān, īn, ūn, ṝn as if they were āṅs, īṅs, ūṅs, ṝṅs (long nasalized vowel with final s), shows itself also in other Vedic forms of combination, which, for the sake of unity, may be briefly stated here together:

a. Final ān becomes āṅ (nasalized ā) before a following vowel: that is to say, āṅs, with a nasal vowel, is treated like ās, with pure vowel (177): thus, devā́ṅ é ’há, úpabaddhāṅ ihá, mahā́ṅ asi. This is an extremely common case, especially in RV. Once or twice, the s appears as ḥ before p; thus, svátavāṅḥ pāyúḥ.

b. In like manner, s is treated after nasal ī, ū, ṝ as it would be after those vowels when pure, becoming r before a sonant sound (174), and (much more rarely) ḥ before a surd (170): thus, raçmī́ṅr iva, sūnū́ṅr yuvanyū́ṅr út, nṝ́ṅr abhí; nṝ́ṅḥ pā́tram (and nṝ́ṅṣ p-, MS.).

c. RV. has once -īṅ before y. MS. usually has aṅ instead of āṅ.