This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. A clear, viscid lubricating fluid secreted by membranes in joint cavities, sheaths of tendons, and bursae.

n. The lubricating fluid secreted by the synovium of a joint or other such structure.

n. A transparent, viscid, lubricating fluid which contains mucin and secreted by synovial membranes; synovial fluid.

n. The lubricating liquid secreted by a synovial membrane: so called from resembling the white of an egg. It is a nearly colorless liquid containing mucin.

n. viscid lubricating fluid secreted by the membrane lining joints and tendon sheaths etc.

"They are made by the union of two or more bones, held together by ligaments of fibrous tissue, and are lubricated by a thick, viscid fluid, called synovia, which is secreted by a special membrane inclosing the joints."

secretion   

synovium    synovial membrane    synovial    synovial capsule   

vomitus    internode    chyle    synovium    catheterization    pus    calcification    papilla    chirality    stoole