retroflex

(verb) bend or turn backward. Synonyms: replicate.

(verb) articulate (a consonant) with the tongue curled back against the palate. Example: "Indian accents can be characterized by the fact that speakers retroflex their consonants."

(adj) bent or curved backward. Synonyms: retroflexed.

(adj) pronounced with the tip of the tongue turned back toward the hard palate. Synonyms: cacuminal.