‖ hydrarthrosisPath.|haɪdrɑːˈθrəʊsɪs| [f. hydro- b + arthrosis.] Dropsy of the joints. 1861Bumstead Ven. Dis. (1879) 233 Gonorrhoeal rheumatism is essentially an hydrarthrosis.1879St. George's Hosp.Rep. IX. 769 A patient whose knee had been laid open for chronic hydrarthrosis.