n. The soft tissue which lines the non-cartilaginous surfaces within joints with cavities (synovial joints). It may emit a joint-lubricating fluid called synovial fluid or simply, synovia.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. a thin membrane in synovial (freely moving) joints that lines the joint capsule and secretes synovial fluid
Word Usage
"RA occurs in people who develop a rogue immune system that attacks the tissue that lines the joint cavities called the synovium leading to degeneration of the joints and the symptoms of the disease."