From Middle Welsh Prydein, from early Proto-Brythonic *Pritanī, a variant of *Pritenī, which survives in Prydyn (“Picts”) and as an early borrowing in Old Irish Cruthin, Irish Cruithne (“Picts”), perhaps from a Proto-Celtic *Kʷritanī, *Kʷritenī, from Proto-Indo-European *kʷer- (“to do”).
- (North Wales, standard, colloquial) IPA(key): /ˈprədai̯n/
- (South Wales, standard) IPA(key): /ˈprədai̯n/
In medieval texts, the term often refers to the northernmost part of the island, beyond the Forth and Clyde. Where the island as a whole is meant, the phrase Ynys Prydain (Latin insula Britanniae, "Isle of Britain") is commonly used.
- Prydain Fawr (“Great Britain”)
|Note: Some of these forms may be hypothetical. Not every possible mutated form of every word actually occurs.|
- “Brit(t)ō” on page 242/3 of the Oxford Latin Dictionary (1st ed., 1968–82)