Brittonic languages
A significant difference between Goidelic and Brittonic languages is the transformation of *"an, am" to a denasalised vowel with lengthening, "é", before an originally voiceless stop or fricative, cf. Old Irish "éc" "death", "écath" "fish hook", "dét" "tooth", "cét" "hundred" vs. Welsh "angau", "angad", "dant", and "cant". Otherwise: