hydrarthrosis

from WordNet (r) 3.0 (2006)

hydrarthrosis
    n 1: inflammation and swelling of a movable joint because of
         excess synovial fluid

from The Collaborative International Dictionary of English v.0.48

Hydrarthrosis \Hy`drar*thro"sis\, n. [NL. See {Hydro-}, 1, and
   {Arthrosis}.] (Med.)
   An effusion of watery liquid into the cavity of a joint.
   [1913 Webster]