Involving many joints. As opposed to monoarticular (affecting just one joint). From the latin articulus, meaning a joint. ... (12 Dec 1998) ... 
(pol″e-ahr-tik´u-lәr) affecting many joints; polyarthric.
a form of juvenile rheumatoid arthritis that affects five or more joints.
Type: Term Pronunciation: pol′ē-ar-tik′yū-lăr Synonyms: multiarticular
Polyarticular: Involving many joints. As opposed to monoarticular (affecting just one joint). From the Latin "articulus," meaning a joint.
polyarthric, polyarticular Pertaining to or affecting many joints.
Pertaining to two or more joints
a form of juvenile rheumatoid arthritis that affects five or more joints.