RETROVERSION
Source: 567
Re′tro‐ver″sion (?), n. [[Cf. F. rétroversion. See Retrovert.]] A turning or bending backward; also, the state of being turned or bent backward; displacement backwards; as, retroversion of the uterus. ☞ In retroversion the bending is gradual or curved; in retroflexion it is abrupt or angular.