Rhotacism
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An oversounding, or a misuse, of the letter r; specifically(Phylol.), the tendency, exhibited in the Indo-European languages, tochange s to r, as wese to were.
Rhotacism meaning & definition 1 of Rhotacism.
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The excessive use of the letter /r/
Rhotacism meaning & definition 2 of Rhotacism.