Inflammation of a joint and its synovial membrane (the tissue that produces fluid inside joints).
From Greek 'arthron' (joint) + 'synovial' (relating to joint fluid, possibly from 'syn-' meaning together + ovum, or from 'syn-' + 'ova' meaning 'like egg') + '-itis' (inflammation). This precise term targets both the joint capsule and its fluid-producing lining.
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