Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
‡ prox (bona vox, Fest. p. 253 Müll.; cf.: prox, bona vox, ut aestimo, quasi proba vox, Paul. ex Fest. p. 252 Müll.), interj., by your leave, Plaut. Ps. 5, 1, 33 Fleck.