Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
sternax, ācis, adj. [sterno], that throws to the ground (poet.): equus, that throws his rider, Verg. A. 12, 364; Sil. 1, 261: cives, that fall prostrate, Sid. Ep. 5, 14 fin.; so of a suppliant, id. ib. 4, 12 fin.