Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
Saetăbis (Sēt-), is, f., a town of Hispania Tarraconensis, celebrated for its flax (now Jativa), Plin. 19, 1, 2, § 9; Sil. 3, 374; Mel. 2, 6.
Hence,