"retroflexion" in the noun sense
1. retroversion, retroflection, retroflexion
a turning or tilting backward of an organ or body part
"retroversion of the uterus"
2. retroflection, retroflexion
an articulatory gesture made by turning the tip of the tongue back against the roof of the mouth
3. retroflection, retroflexion
the act of bending backward
Source: WordNet® (An amazing lexical database of English)
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