Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
Ŏpĭgĕna, ae, f. [Ops-gigno], the midwife, an epithet of Juno, as the tutelar goddess of lying-in women, Mart. Cap. 2, § 149; cf.: Opigenam Junonem matronae colebant, quod ferre eam opem in partu laborantibus credebant, Fest. p. 200 Müll.