prerhotic
Occurring before the letter ⟨r⟩ or before any one of the sounds that letter tends to…Occurring before the letter ⟨r⟩ or before any one of the sounds that letter tends to represent (e.g., [r], [ɽ], [ɹ], [ɻ], [ʀ], [ʁ], etc.).
Meaning
1 senses(not comparable, rare)Occurring before the letter ⟨r⟩ or before any one of the sounds that letter tends to represent (e.g., [r], [ɽ], [ɹ], [ɻ], [ʀ], [ʁ], etc.).
1993 Summer, Ralph H. Emerson, “The Distribution of Eighteenth-Century Prerhotic O-Phonemes in Walker’s Critical Pronouncing Dictionary” in American Speech LXVIII, № 2, pages 115–138