from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Pronouncing the letter r wherever it appears, as in bar (/bɑːɹ/) and bard or barred (/bɑːɹd/); this trait is common in much of the United States, Canada, many parts of the north and west of England, Ireland, and Scotland.
- adj. Having the quality of the said letter. This includes the sounds of the IPA symbols /ɹ/, /ɻ/, /ɚ/, /ɝ/, and some would say /r/, or r coloring.
Back-formation from rhotacism, coined by John Wells 1968 (Wiktionary)