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132 Keltic; thus Lat. lectus, Ir. lecht ‘grave’, √leɡh‑; W. gwaith, Ir. fecht < Pr. Kelt. *u̯ekt‑, √u̯eg̑h- § 100 i (2).

(1) Ar. ‑pt‑, ‑kt‑, ‑qt‑, ‑q$u̯$t‑, all gave ‑kt- in Pr. Kelt., §§ 86 ii, 88, 89 ii; this appears in Ir. as ‑cht, in W. as ‑i̯th, etc. § 108 iv (1).

In other groups of dissimilar explosives the first was assimilated to the second in Pr. Kelt.; thus tk > kk > Ir. cc, W. ch; as W. achas ‘hated’, Ir. accais ‘curse’ < *akkass- <*ad-kəd‑t- § 87 ii.—W. achar ‘loves’ < *akkar- < *ad-qər‑: Lat. cārus § 88. Lat. ‑pt- was introduced too late to become ‑kt- as above, and so became tt, as the habit of assimilation persisted in Brit.; this gives W. th; as pregeth ‘sermon’ < pre̦ceptum, ysgrythur < scriptūra.

When the group consisted of mediae, the double media became a single tenuis in Brit., giving a media in W.; thus dg > gg > Brit. c > W. g; it gives Ir. c or cc sounded gg, Mn. Ir. g. Examples: Ir. acarb, W. agarw̯ ‘rough, rocky, unfertile’ 180 < *aggaru̯- < *ad-g̑hₑr’su̯‑: Ir. garb, W. garw ‘rough’ < *g̑hₑr’su̯‑: Gk. χέρσος, Skr. hr̥ṣitáḥ ‘bristling’, Av. zarštva- ‘stone’, Lat. horreo, hirsūtus, √g̑heres‑, § 95 iv (3).—W. aber, O. W. aper ‘confluence’, aberth ‘sacrifice’ < *abber- < *ad-bher‑, √bher‑.

(1) Ar. tt became tˢt, and Ar. dd(h) became dᶻd(h), § 87 ii, § 91 ii, giving W. s (ss) and th respectively. But when d + t or t + t came together in Kelt., they became tt, which, like Lat. tt, appears in W. as th; thus W. athech ‘skulking’ < *ad-teg‑s‑: W. techu ‘to skulk, lie hidden’, √(s)theg- § 92 i.—W. saeth ‘arrow’ < Lat. sagitta.—For tt + liquid see § 99 v (4).

Similarly d‑d when they came together in Kelt. > Brit. t > W. d; as in edifar ‘repentant’ < *ad-dī-bar‑: W. bâr ‘indigna-