Source : Webster's Revised Unabridged Dictionary (1913)

Synovial \Syn*o"vi*al\, a. [Cf. F. synovial.] (Anat.)
   Of or pertaining to synovia; secreting synovia.

   {Synovial capsule}, a closed sac of synovial membrane
      situated between the articular surfaces at diarthrodial
      joints.

   {Synovial fluid}, synovia.

   {Synovial membrane}, the dense and very smooth connective
      tissue membrane which secretes synovia and surrounds
      synovial capsules and other synovial cavities.

Source : WordNet®

synovial
     adj : relating to or secreting synovia