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200 (1) In Brit. the nom.-acc. sg. neut. ending must in some cases have been *‑ū (instead of *‑u), cf. Lat. cornū, etc. (so sometimes in Skr., see Brugmann² II ii 144), as in *dakrū > W. deigr ‘tear’ (e.g. llawer deigɏr a wyleis i ii 129 ‘many a tear have I wept’, bob deigr Dat. vii 17 “”). The pl. ending might be *‑ou̯a (< *‑uu̯ə) or ‑ū (< *‑uu̯ə contracted, § 63 vii (2)); deigr ‘tears’ from the latter is doubtful, though used by Gr.O. 50; the former gives the usual pl. dagrau § 76 iii (2). See also § 125 iii Note.

cainc ‘branch’ may be a fem. u̯ā-stem, with nom. sg. in ‑ū, Thurneysen Gr. 182; thus cainc < *kaŋkū, pl. cangau, Ml. W. cag̃eu 48 < *káŋkou̯ās.

The pl. ending ‑au does not affect a preceding vowel, see § 76 iii (2); ceg̃eu 47 is a scribal error as shown by cag̃eu 48.

i. ‑i̯on and ‑on come from Brit. ‑i̯ones and ‑ones, pl. endings of n-stems.

‑i̯on is added to (1) many nouns denoting persons, as dyn ‘man’, pl. dynion; mab ‘boy, son’, pl. meibion, Ml. meibon § 35 ii (1), O. W. mepion § 70 ii (1); gwas ‘servant’, pl. gweision, Ml. gweisson 33; ŵyr ‘grandson’, pl. w͡yrion, Ml. wyron  49; gwastrawd ‘groom’, pl. gwastrodẏon  33; including derivatives in ‑(h)ai, ‑ydd, ‑og Ml. ‑awc, ‑or Ml. ‑awr, ‑ig, ‑awdr, as gwestai ‘guest’, pl. gwesteion Ỻ.A. 168; crydd, pl. cryddion,