Longman Dictionary English From Longman Dictionary of Contemporary EnglishRelated topics: Linguisticsretroflexret‧ro‧flex /ˈretrəfleks/ adjective technical SLa retroflex speech sound is made with the end of your tongue pointing backwards and upwardsOrigin retroflex (1700-1800) Modern Latin retroflexus, from Latin flexus “bent” ldoceonline.com