Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
† ŏrexis, is, f., = ὄρεξις, a longing, appetite (post-Aug.): rabidam facturus orexim, Juv. 6, 428: hinc surgit orexis, id. 11, 127: orexin, Lampr. Elag. 29 fin.