Definition of rhotacism
1 : a defective pronunciation of r especially : substitution of some other sound for that of r
2 linguistics : the historical change of a voiced consonant sound (such as the alveolar consonants \z\, \d\, \l\ or \n\) to an r-like consonant
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Time Traveler for rhotacism
The first known use of rhotacism was in 1830
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