Webster's English Dictionary

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retroflex

ret.ro.flex or ret.ro.flexed \'re-tr*-.fleks\ \-.flekst\ aj [ISV, fr. NL 
   retroflexus, fr. L retro- + flexus, pp. of fl]ectere to bend 1: turned or 
   bent abruptly backward : REFLEXED  2: articulated with or involving the 
   participation of the tongue tip turne d up or curled back just under the 
   hard palate {~ vowel}