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Synonyms for Retroflex (same or very similar meaning)

WordNet sense 1 (bend or turn backward):
replicate

WordNet sense 2 (bent or curved backward):
retroflexed

WordNet sense 3 (pronounced with the tip of the tongue turned back toward the hard palate):
cacuminal

WordNet sense 4 (directed or facing toward the back or rear):
backward


From the ODE community, based on WordNetadd/edit