Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
Septĭcĭānus (Septĭt-), a, um, adj., of or belonging to a Septicius, Septician: libra, a Septician pound, which, in the second Punic war, was reduced from twelve to eight and a half unciae, Mart. 8, 71, 6; so too, argentum, id. 4, 89, 3.