phonetics: of, relating to, having, or being an accent or dialect in English in which an /r/ sound is retained before consonants (as in pronouncing hard and cart) and at the end of a word (as in pronouncing car and far)
a rhotic dialect/accent
a rhotic speaker
Arguably one of the greatest divisions in English is between rhotic and non-rhotic accents, which is to say our speech and accents are immediately distinguishable based on the pronunciation, or lack thereof, of /r/-like sounds. Jordan MacKenzie
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phonetics, of a vowel: influenced in coloring by an adjacent /r/ sound