Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
prō-gĕnĕro, āre, v. a., to beget, engender, generate (rare; not in Cic. or Cæs.): nec imbellem feroces Progenerant aquilae columbam, Hor. C. 4, 4, 31.
Of bees: fetus, Plin. 11, 16, 16, § 46.
In pass.: qui (vituli) ex his progenerantur, Varr. L. L. 9, § 28 Müll.: si res exigit, ut plurimi mares progenerandi sint, Col. 7, 3, 12; 9, 14, 4; 6: patrueles, id est qui ex duobis fratribus progenerati sunt, Gai, Inst. 3, 10.
Absol.: ut progenerare possit, Col. 3, 10, 15.