Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
† pŏlĭon or -ĭum, ĭi, n., = πόλιον, a strong-smelling plant, perh. the poley-germander: Teucrium polium, Linn.; Plin. 21, 7, 21, § 44; 21, 20, 84, § 145; Scrib. Comp. 83.