Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
† pleurītis, ĭdis, f.,  =  [?PLEURI = ?TIS
?]. 
- I.  A sharp pain in the side, pleurisy (pure Lat. dolor lateris): arthritis, tussis, pleuritis, phthisis, Vitr. 1, 6.
 
- II.  The register in a hydraulic organ, Vitr. 10, 13 dub. (al. plinthis).