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1. The rhotic articulation of a sound, such as a vowel, when it is followed by an "r" in writing, as in the word park.
2. See rhotacism.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.