…ati-, Gr. eikosi, Lat. uigintT, OE twegen-tig, Alb. nje-zet. Arm. k c san, To A wiki ETYM: For the phonetic development in Brit. cf. W ucher < *wesk w ero- ‘evening’. The PIE form *(h|)wi(d)kmtih, may be the result of dissimilation from *dwi-dkmtihi (for similar examples cf. Lubo…