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.