Definition of synovial adjective from the Oxford Advanced Learner's Dictionary

 

synovial

 adjective
adjective
BrE BrE//saɪˈnəʊviəl//
 
, BrE//sɪˈnəʊviəl//
 
; NAmE NAmE//sɪˈnoʊviəl//
 
(biology)
 
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(of a joint) having a membrane (= a piece of very thin skin) containing liquid between the bones, which allows the joint to move freely Word Origin mid 18th cent.: from modern Latin synovia, probably formed arbitrarily by Paracelsus (c. 1493-1541), the Swiss physician.
See the Oxford Advanced American Dictionary entry: synovial