pigmented villonodular synovitis

[ vĭl′ō-nŏjə-lər ]

n.

Diffuse outgrowths of the synovial membrane of a joint, usually the knee.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.