[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.

Webster 1913 Dictionary edited by Patrick J. Cassidy