synovial fluid
Anatomical term for the viscous fluid found in joint cavities, reducing friction between articular cartilages.
Inside the joint, there is a fluid called synovial fluid.
olecranon bursitis
olecranon bursitis; miner's elbow
achillobursitis
Compound of 滑 (katsu, 'smooth, slippery') and 液 (eki, 'fluid, liquid'). The derivation is straightforward from the kanji components.