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§ 122 Ml. W. bugeil ‘shepherd’, pl. bugelyẟ Ỻ.A. 109,  245 < *boukoli̯os pl. *boukolíi̯ī. This was a rare type, and in Mn. W. a new pl. was formed: bugail, pl. bugeiliaid. But the f. adain ‘wing’ (i̯ā-stem), pl. adanedd, had a new pl. made by affecting this, as if the word belonged to the ‑i̯o- declension: adain, pl. adenydd § 125 iii.

The ending was ‑oeẟ in brenhinoet 53 ‘kings’, Mn. W. brenhinoedd; but the more usual Ml. form is breenhineẟ 120, brenhineẟ  178–9, prob. with ‑eẟ for ‑oeẟ § 78 ii. So teyrneẟ 1313, D.G. 181 ‘kings’, ewythreẟ  140 ‘uncles’; cystlwn ‘family’, pl. cystlyneẟ  1267.
 * Cystlynedd Gwynedd i gyd,
 * Cynafon Hwlcyn hefyd.—G.Gl. 1/no. 49.

‘All the families of Gwynedd, and the scions of Hwlcyn too.’

Fem. i̯ē- and i̯ā-stems. (1) The vowel is affected in the sg. Pl. ending ‑edd.

blwyddyn ‘year’ (Ir. blīadain) < *bleidonī, pl. blynedd < *blidníi̯ās § 125 v (1); this pl. form is used only after numerals; for other purposes a new pl. was formed by adding ‑edd to the sg., as blwyẟyneẟ 37, then by metath. blwynyẟeẟ Ỻ.A. 105, Mn. W. blynyddoedd, S. W. dial. blynyẟe(ẟ) (whence latterly a false blynyddau see ii (4)).—modryb ‘aunt’ < *mātr-aq$u̯$ī (√ōq$u̯$- § 69 ii (4)), pl. modrabedd 282 (so in Gwyn. dial.; ‑o- < sg.) < *mātraq$u̯$íi̯ās; the form modrybeẟ  1362 seems to be re-made from the sg., as modreped  2.—edau ‘thread’, pl. edafedd § 76 vii (1); adain ‘wing’ pl. adanedd, etc., see § 125 iii.