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214 some nouns with two singulars, as deigryn ‘tear’, pl. dagrau § 130 ii.

Class 3. A pl. ending is added to the sg. ending, as gelyn ‘enemy’, pl. gelinion 71, gelynẏon  71, Mn. W. gelỿni̯on; defnyn Gr.O. 48, defnynnau Luc xxii 44; dalen ‘leaf’, pl. dalennau Ex. xxxix 3; mursennod, bythynnod § 123 ii.

In some nouns final ‑yn or ‑en is not the singular ending but part of the stem; in these the n of ‑yn is not necessarily double when an ending is added; and ‑en is affected to ‑yn; thus telɥn f. ‘harp’, pl. telỿnau; tyddɥn m. ‘small farm’, § 98 i (3), pl. tỿddỿnnod, Ml. W. tyẟynneu i 168, 180, 182; maharen m.  26, myharen D.G. 202 ‘ram’, pl. meheryn; crogen, cragen, ‘shell’, pl. cregin § 117 iii (3); elltrewyn § 76 v (5), pl. *‑yneẟ not found; blwyẟyn § 122 iv (2).

The pl. of a few nouns is formed by adding a pl. ending to a derivative: glaw ‘rain’, pl. glawogyẟ 324,  98; Ml. W. cristawn ‘christian’ pl. cristonogion  71, Mn.W. cristi̯on, pl. cristi̯onogi̯on, cristnogi̯on; llif ‘flood’, pl. llifogydd; addurn ‘adornment’, pl. addurniadau; crwydr ‘wandering’, pl. crwydr(i̯)adau; serch ‘affection’, pl. serchi̯adau; dychryn ‘terror’, pl. dychryni̯adau, dychrynfeydd; rheg ‘curse’, pl. rhegfeydd; dyn ‘man’, pl. dyniabon  1196, dyneẟon Ỻ.A. ii beside dyni̯on; cas Deut. vii 10 ‘hater, foe’, pl. caseion W.Ỻ. 8, also pl. cas do. 5.