Synovia

Webster's Practical Dictionary- A Practical Dictionary of the Englih Language · 1884 · p. 446

sin-o'vT-a, n. (Anat.) A fluid secreted the synovial capsules of the joints, serving as a cating fluid to the latter.— Syno'vial, a. Of, or to, the synovia, or lubricating fluid of the joints.