Lewis Short
(adjective) : ūnĭgĕna, ae (collat. form oenĭgĕ-nŏs unigenitus, Paul. ex Fest. p. 195 Müll.), unus-gigno.
* Only-begotten, only: idcirco singularem deus hunc mundum atque unigenam procreavit,Cic. Univ. 4, 10.—In Christian authors, of Christ: dominus deusque,Paul. Nol. Carm. 5, 46; cf. unigenitus.
* Born of one parent, of one or the same family (poet.): te, Phoebe, relinquens Unigenamque simul cultricem montibus Idri, i. e. Diana, sister of Phoebus. Cat. 64, 301; of Zephyrus, as brother of Memnon, id. 66, 53.
Charlton T. Lewis, Charles Short, A Latin Dictionary