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120 huawdɏl 1301.) It is probable that the misspelling boreu for bore § 31 ii 2 sprang from boreuach the debased form of boryach.

yw follows the rule, as bɥw, bỿwɥd, bỿwi̯og; clɥw, clỿwed; llɥw, llỿwɥdd, llỿwi̯o, etc., except in late formations, especially from forms in which ɥw became iw § 77 v, as in amrɥwi̯o (sounded amriwi̯o), distrɥwi̯af (distriwi̯af), etc. J.D.R. writes amrywio (y ≡ ɥ) [xvi], distriwiaw [xix]. So niwli̯og, niwloedd § 37 ii.

The rising diphthong w̯y follows the rule: gw̯ɥrdd, gw̯ỿrddi̯on, etc.; but w̯ỿ generally becomes w § 66 ii. Such a pronunciation as gw̯ɥntoedd is recent; but gw̯ɥwo ‘to wither’ may be old, as the ɥ may have resisted mutation between two w̯’s.

(6) The rule does not apply to the falling diphthong w͡y, in which the y is consonantal. In this y must necessarily be ɥ always, as mŵyn, mw͡ynach, mw͡yni̯on; and the ɥ remains when the w͡y is mispronounced as w̯ɥ § 38 iii, as Gw̯ɥ́nedd for Gw͡ynedd.

iii. (1) In the words sylw, gw̯yry, the final w and y were non-syllabic § 42, § 110 ii; hence the y is ɥ; thus sɥlw (but sỿlw̯i), gw̯ɥrỿ.

(2) With the exceptions mentioned in ii, the sound which is now common to y and u, if it occurs in the penult, is to be written u. Thus we write m u nud, mun u dau, papur, pap u rau. Following this rule the translators of the Bible were misled by the late disyllabic pronunciation of sylw to write it sulw; in late editions this error is corrected.

In a few cases u in the ultima has come to be mistaken for y and mutated to ỿ in the penult; as in ysgrythyrau in the Bible (but ysgrythurau correctly in the 1727 edn.) pl. of ysgrythur (< Lat. scriptūra) regarded as ysgrythyr on the analogy of llythyr ‘letter’. So testynau for testunau, Early Mn. W. testunion, pl. of testun (<Lat. testimōnium) treated as testyn; corynau ‘crowns’, corynfoel 33 ‘bald-headed’, from corun  171 (< Lat. corōna) treated as coryn.

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The following tables show the affected and unaffected forms of vowels as they alternate in Mn. W.

i., § 68.

The affected sound occurs in the ultima. It is occasionally found in the penult in compounds, as in cromlech (crwm ‘arched’); and in superlatives, as gwennaf, tromaf § 147 iii. In bychan, f. bechan, the e