Webster’s Revised Unabridged Dictionary · 1913
Retroversion
Re′tro·ver′sion (·vẽr′shŭn), 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.