Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
The word rheum could not be parsed. Trying a normal dictionary lookup:
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† rheuma, ătis, n., = ῤεῦμα.
† rheumătĭcus, i, m., = ῤευματικός, one troubled with rheum, that has a catarrh, Plin. 29, 6, 39, § 142.
† rheumătismus, i, m., = ῤευματισμὀς, rheum, catarrh (pure Lat. fluctio): levis humoris fluor quem Graeci rheumatismum vocant, Cael. Aur. Acut. 2, 27, 146; Plin. 22, 18, 21, § 46; 23, 2, 32, § 66; 24, 3, 3, § 7 et saep.
† rheumătīzo, āre, v. n., = ῤευματίζομαι, to be troubled with rheum, to have a catarrh, Theod. Prisc. 1, 10.