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rhotacism

[roh-tuh-siz-uh m] /ˈroʊ təˌsɪz əm/
noun
1.
Historical Linguistics. a change of a speech sound, especially (s), to (r), as in the change from Old Latin lases to Latin lares.
2.
excessive use of the sound (r), its misarticulation, or the substitution of another sound for it.
Origin
1825-1835
1825-35; < Greek rhô rho + (io)tacism
Related forms
rhotacistic, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for rhotacism

rhotacism

/ˈrəʊtəˌsɪzəm/
noun (phonetics)
1.
excessive use or idiosyncratic pronunciation of r
Derived Forms
rhotacist, noun
rhotacistic, adjective
Word Origin
C19: from New Latin rhōtacismus, from Greek rhōtakizein (verb) from the letter rho
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for rhotacism
rhotacism
1834, from Mod.L. rhotacismus, from Gk. rhotakizein, from rho "the letter -r-," from Heb. or Phoenician roth. Excessive or peculiar use of the -r- sound (cf. the "burr"), especially the conversion of another sound (usually -s-) to -r-.
Online Etymology Dictionary, © 2010 Douglas Harper
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