in phonetics, a consonant sound produced with the tip of the tongue curled back toward the hard palate. In Russian the sounds sh, zh (like the ... [2 related articles] Found on http://www.britannica.com/eb/a-z/r/39
retroflex 1. Bent, curved, or turned backward. 2. Pronouncing certain words and/or letters with the tip of the tongue turned back against the roof of the mouth. 3. A sound pronounced with the tongue in retroflex position, as the sound 'r' in some varieties of English. Found on http://www.wordinfo.info/words/index/info/view_unit/1840/