1776, from Modern Latin retroflexus, past participle of retroflectere "to bend back," from retro (see retro-) + flectere "to bend" (see flexible). The verb (1898) is a back-formation from retroflexed (1806), from the adjective.
Indian accents can be characterized by the fact that speakers retroflex their consonants
retro
retro-
retroactive
retrocopulation
retrofit
retroflex
retrograde
retrogress
retrogression
retrogressive
retrospect
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