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§ 75 dropped § 100 vi, and o before the vowel developed like u before a vowel, that is, as ou̯; thus *dó esō > *dói̯ǖ > *dóī > *dóu̯ī > *deu § 76 v (1), whence deuaf § 193 x (5); and *do eset > *doi̯et > *doet > *dou̯et > daw, or without diphthongization *do-et > do, see ib.; so *moi estō > *mo estī > *mo ys > moes § 200 ii. Followed by ī after the accent it gives &#8209;i, as in &#8209;ẟi f. sing. ‘to her’ < *´&#8209;doi̯ī < *´&#8209;do-sī § 210 x (1).

Ar. ōi gave Kelt. āi and developed accordingly.

(1) Ar. ei remained in Pr. Kelt. In Gaul. it is written e or ει, as Devo-gnata, Δειουονα. In Ir. it appears as ē or īa. In W. before a consonant it became w͡y. Thus W. gŵyẟ ‘presence’ for *gw̯ŵyẟ < Ar. *u̯eid- § 63 iv;—mor-dw͡y ‘sea voyage’ < *mori-teig- § 103 ii (1), etc.

Before a vowel ei fell together with ii̯, see below.

Ar. ēi before a vowel > Kelt. ī > W. i. Thus W. dī́od, Ml. diawt ‘drink’ < *dhēi-āti&#8209;s, √dhēi- ‘suck’.—W. llī́aws ‘multitude’, Bret. liez < Brit. *līā́ssās < *līāstāts < *(p)līōs-tāts, a noun in *&#8209;tāt- from the cpv. *plē-i̯ōs: Lat. insc. pleores, Gk. πλείων. Before Kelt. o it becomes u, as in llüosog, Ml. lluossauc < Brit. *līu̯ossā́ko&#8209;s an extension *lī$u̯$osso&#8209;s < *(p)līos-to&#8209;s an adj. formed from *plē-i̯ōs like Lat. honestus from honōs; see § 76 ix (2), § 74 i (2), § 169 iii (3). Before a consonant ēi > ē giving Kelt. ī, W. i.

ai and ei fell together with ii̯ before vowels. the accent the i̯ became ẟ, in other positions it remained as i̯. Thus:

Accented íi̯ (or ái̯ or éi̯), which is generally in the penult, but may be ante-penultimate, gives W. &#8209;yẟ; thus W. rhyẟ ‘free’ < *príi̯os: Goth. freis, Eng. free;—trefyẟ ‘towns’ < *trebíi̯es;—trydyẟ ‘third’ m. < *tritíi̯os; with &#8209;a in the ult. it gives &#8209;eẟ, as trydeẟ ‘third’ f. < *tritíi̯ā. In the ante-penult &#8209;yẟ&#8209;, as W. ysbyẟad ‘thorn’: Ir. scē, gen. pl. sciad.

Post-tonic ´&#8209;ii̯ gave *ai̯i̯, which became oeẟ, § 62 i (2);