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Meaning of rhotacize

rho•ta•cize

Pronunciation: (rō'tu-sīz"), [key]
— v., -cized, -ciz•ing.
—v.t.
  1. to change (a sound) to an (r); subject to rhotacism.
  2. to pronounce (a vowel) with r-color.
—v.i.
  1. to undergo rhotacism.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.