synovial
adjective/saɪˈnəʊviəl/, /sɪˈnəʊviəl/
/sɪˈnəʊviəl/
(biology)- (of a part of the body ) having a membrane (= a piece of very thin skin) containing liquid between the bones, which allows the joint to move freelyWord Originmid 18th cent.: from modern Latin synovia, probably formed arbitrarily by Paracelsus (c. 1493-1541), the Swiss physician.
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synovial