#1 retroflexion n. [retroversion, retroflection] a turning or tilting backward of an organ or body part; "retroversion of the uterus". wn
#2 retroflexion n. [retroflection] an articulatory gesture made by turning the tip of the tongue back against the roof of the mouth. wn
#3 retroflexion n. [retroflection] the act of bending backward. wn
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