Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
Post-verta or Post-vorta, ae, f. [verto], a goddess presiding over childbirth, who was invoked when the child made a wrong presentation: Carmentes, quarum altera Postverta cognominata’st, Prosa altera, a directi perversique partus et potestate et nomine, Varr. ap. Gell. 16, 16, 4; Ov. F. 1, 633.
Acc. to Macrobius, a goddess presiding over the future (opp. Antevorta), Macr. S. 1, 7.