iv. Ar. su̯- remained in Pr. Kelt., and gives s in Ir., chw̯‑, hw̯- in W., § 26 vi. Thus Ar. *s̯uesōr > Ir. siur, W. chw̯aer ‘sister’ § 75 vii (2).—Ar. *su̯id‑t- > *su̯itˢt- > W. chw̯ŷs ‘sweat’: Skr. svídyati ‘sweats’: Lat. sūdor < *su̯oid‑: E. sweat.—Ar. *su̯ek̑s > W. chw̯ech, Ir. sē: Gk. ῾ϝέξ, § 101 ii (2).—Ar. *su̯ek̑(u)r- > W. chw̯egrwn ‘father-in-law’, chw̯egr ‘mother-in-law’: Lat. socer, socrus, Gk. ἑκυρός, ἑκυρᾱ́, Skr. s̑vás̑uraḥ, s̑vas̑rū́ḥ.—W. chwi ‘you’ < *s‑u̯es: Lat. vōs § 159 iv. Before ɔ from ā it was unrounded to h, as in hawdd < *su̯ād- § 148 i (6).
Medial ‑u̯s- > hu̯ > W. w̯ § 76 ii (3).
§ 95. i. Ar. sm‑, sn‑, sl‑, sr- remained in Pr. Kelt, and appear in Ir. unchanged, in W. as m‑, n‑, ll‑, rh‑. Thus, sm‑: Ir. smēr ‘blackberry’, W. mwyar ‘blackberries’ § 75 vi (2).—Ir. smir gen. smera ‘marrow’, W. mêr id.: Gk. σμυρίζω, μυρίζω ‘I anoint’, E. smear, Lith. smarsas ‘fat’.—sn‑: Ir. snechta, W. nyf ‘snow’: Lat. ninguit, O. H. G. snēo, E. snow § 92 iii.—Ir. snāim ‘I swim’, W. nawf ‘swimming’: Lat. nāre, Skr. snā́ti ‘bathes’.—Ar. √senē(i̯)- ‘thread’: Ir. snīim, W. nyddaf ‘I spin’, Ir. snāthat, W. nodwydd ‘needle’: Lat. nēre, E. snare, Skt. snā́yu ‘bowstring’.—sl‑: Ir. slemun, W. llyfn ‘smooth’: Lat. lūbricus < *sloibricos, E. slip.—Ir. slūag, W. llu ‘retinue’: O. Bulg. sluga ‘servant’.—sr‑: Ar. *sreu̯‑: Ir. sruth ‘stream’, W. rhwd ‘dung-water’ (rhwd tomydd I.G. 238), rhewyn ‘gutter’: Lith. srutà ‘dung-water’, Gk. ῥυτός, ῥεῦμα, etc. § 58 vi, § 76 iv (1).—Ir. srōn ‘nose’ < *srokn‑, W. rhoch ‘snore’ < *srokn- § 99 vi (3): Gk. ῥέγχω, ῥέγκω ‘I snore’, ῥόγχος ‘snoring’, ῥύγχος ‘pig’s snout’, § 97 v (3).
As s- before a vowel sometimes remains in W., so a few examples occur of s- before a sonant, as (y)snoden ‘band, lace’, Ir. snāthe gl. filum < *sn̥̄t‑, √senē(i̯)‑;—(y)slath beside llath ‘lath’, Ir. slat: E. ‘lath’, O. H.G. latta without s‑. The N.W. dial. slyw̯en ‘eel’ is prob. for *sỿllỿwen: Corn. selyas, syllyes ‘eels’, Bret. silienn (stlaoñenn) ‘eel’; the Mn. lit. W. llỿsỿwen, S. W. dial. llỿsw̄́en, seems to be a metathesized form; prob. √selei‑: Lat. līmax. The second element is perhaps ‑onɡhu̯‑: Ir. esc-ung ‘eel’: Gk. ἔγχελυς ‘eel’ (the root has many forms, see Walde² s.v. anguis).
ii. (1) Medial ‑sm‑, ‑sn‑, ‑sl‑, ‑sr- probably remained in Pr. Kelt., but became ‑mm‑, ‑nn‑, ‑ll‑, ‑rr- in both Ir. and W. (In W. ‑mm- is written ‑m-, and ll is now the voiceless ƚƚ,
