Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
ŏlĕōsus, a, um, adj. [oleum], oily, full of oil (Plin.): semen, Plin. 27, 12, 81, § 106: butyrum, id. 28, 9, 35, § 134.