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: Webster's Revised Unabridged Dictionary (1913)