O pater, O genitor, O sanguen dis oriundum!
"The Roman Poets of the Republic"
W. Y. Sellar
Its difference from true grammatical gender is as follows:- Let the Latin words genitor and genitrix be declined:- Sing.
"The English Language"
Robert Gordon Latham
The phrases used were already classic when Catullus employed them before Seneca: "Suscipit, O Gelli, quantum non ultima Thetys Non genitor Nympharum, abluit Oceanus."
"Montaigne and Shakspere"
John M. Robertson