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204 ‑edd and ‑oedd are added to nouns orig. of other declensions as follows:

‑eẟ in Ml. W., ‑oedd in Mn. W. are added to tir m. ‘land’ (an old neut. s-stem), pl. tiret (‑t ≡ ‑ẟ) 33, tireẟ  40 (beside tirion § 35 iii), Mn. W. tiroedd D.G. 436, 524; mynydd m. ‘mountain’ (< *moníi̯o‑), pl. mynyẟeẟ 250,  11,  40, Mn. mynyddoedd; dwfr m. ‘water’ (neut. o-stem), pl. dyfreẟ Ỻ.A. 54, 65, Mn. dyfroedd.

‑oedd was added to cant m. ‘hundred’ (neut. o-stem), pl. cannoedd; nerth m. ‘strength’ (neut. o-stem); mil f. ‘thousand’; mur m. ‘wall’, pl. muroeẟ 191, muroedd  237, later muriau; llu m. ‘host’ (m. o-stem), pl. lluoeẟ  175, Mn. lluoedd; byd m. ‘world’ (m. u-stem), pl. bydoeẟ i 199, Mn. bydoedd; nifer m. ‘host’, pl. niveroeẟ 54, Mn. niferoedd; mis m. ‘month’, pl. misoedd; teyrnas f. ‘kingdom’, pl. tyrnassoeẟ 50, Mn. teyrnasoedd; tŵr m. ‘tower’ (< E. < Fr.), pl. tyroeẟ 191, tyreu do. 133, Mn. tyrau; iaith f. ‘language’, pl. ieithoeẟ 469,  4, Mn. ieithoedd; gw̯ledd f. ‘feast’, pl. gwleddoedd D.G. 524, gwleddau do. 8; gwisg f. ‘dress’, pl. gwisgoedd; oes f. ‘age’, pl. O. W. oisou (with ð added at some distance, see fac. 2, for ‘deest’ according to Lindsay, EWS. 46), Ml. W. oessoeẟ Ỻ.A. 103, oesseu  15, 19, Mn. W. oesoedd, oesau; achoet (t ≡ ẟ) B.B. 53, Mn. achoedd, achau ‘lineage’ both in L.G.C. 213, sg. ach f.; dyfnderoedd ‘depths’, blinder-oedd, ‑au ‘troubles’.

i̯o-stems. (1) The vowel is affected in the sg.; the pl. ends in ‑ydd, ‑oedd, ‑edd.