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96 i. Pr. Kelt. ī (< Ar. ē, ēi̯, ī) remained in Brit., and Brit. and Lat. ī remain in W., § 59 iii, iv. Further examples: W. hīr ‘long’, Ir. sīr < Pr. Kelt. *sīros < *sē-ro&#8209;s: Lat. sērus;—W. gwīn < Lat. vīnum. It is, of course, shortened in W. before two consonants; as gwĭ́n-llan ‘vineyard’.

i. Pr. Kelt. ū, which remains in Ir., and apparently remained in Gaul., as shown by the spelling ου in the second element of Αὐγουστό-δουνον, advanced in Brit. towards ü, for it appears as ī in W., while Lat. ū borrowed into Brit. gives u in W.; thus Pr. Kelt. *dūnom > Ir. dūn, W. dīn ‘fort’, dinas ‘city’: O. E. tūn, E. town;—Pr. Kelt. *glūn- > Ir. glūn, W. glīn ‘knee’ § 63 vii (4);—Pr. Kelt. *kū > Ir. cū ‘dog’, W. cī, § 89 iii.—But Lat. pūrus gives pūr, mūtus gives mūd, etc.

For Lat. ē see § 75 iii (1); for Lat. ō see § 76 ii (1).