Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
† sēptĭcus, a, um, adj., = σηπτικός, producing a putrefaction, putrefying, septic: vis, Plin. 30, 4, 10, § 291 (Jahn, smecticus): dos, id. 34, 18, 55, § 177.