Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
‡ prŏgĕnĭcŭlo, āre [pro-geniculum], to fall on the knees, to beg on one’s knees: progeniculo, γουνοῦμαι, Gloss. Lat. Gr.: progeniculat, γονυπετεῖ, ib.