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216 A noun with a pl. ending sometimes has its vowels affected as an additional sign of the pl., as ceraint for carant § 123 v, adenyẟ for adaneẟ § 125 iii, brodyr for broder § 124 i, which are therefore, in a sense, double plurals.

i. A noun not ending in ‑yn or ‑en may have more than one pl. form in the following ways:

One pl. may be formed by affection and one by the addition of an ending: môr ‘sea’, pl. mŷr, moroeẟ § 122 ii (4); arf ‘weapon’, pl. arveu 97, 99, etc., poet, eirf D.G. 2; esgob ‘bishop’, pl. esgyb, later esgobion (15th cent, Gnt.O.  14967/87), esgobiaid (T.A.  14975/61), the first and last now obsolete; Ml.W. kévɏnderw̯ ‘cousin’, pl. kévɏndɥru,  i 222, Mn. W. cefnder, pl. cefndyr, cefnderoedd L.G.C. 167.

Two or more plurals may be formed by adding different endings: tref ‘town’, pl. trefi, trefydd § 122 ii (2); kaer ‘castle’, pl. keyrydd, kaeroedd, caereu, do. (3); achau, achoedd L.G.C. 213 ‘ancestry’; dyn § 127, etc. See § 131 i.

Two plurals with the same ending may have different vowel changes; thus Ml. W. ceing old pl. cangeu § 125 iii, newer pl. ceingheu Ỻ.A. 144; these survive in Mn. W. as cainc pl. cangau, ceinciau. So cawr ‘giant’, pl. ceuri, cewri § 76 iv (3); achaws, achos ‘cause’ pl. achwysson § 125 v (3), achuysẏon i 30, and achosion.

A noun ending in ‑yn or ‑en may have more than one pl. form as follows:

Some nouns of class 1, § 126 i, have two plurals, one without and one with the vowel affected; as gwïalen ‘twig’, pl. gwḯal or gwḯail; seren ‘star’, pl. sêr 26, or sɥ̂r Ỻ.A. 5, the latter now obsolete; collen ‘hazel’, pl. coll  32, generally cɥll; onnen ‘ash’, pl. onn, more usually ɥnn; mellten ‘flash of lightning’, pl. mellt Ỻ.A. 107, rarely mɥllt  259.