What is the meaning of Rhotic?

That allows the phoneme /ɹ/ even when not followed by a vowel, as in bar (/bɑːɹ/) and bard or barred (/bɑːɹd/); who speaks with such an accent.

Having a sound quality associated with the letter R; having the sound of any of certain IPA symbols, including /ɹ/, /ɻ/, /ɚ/, /ɝ/ and /r/.