n.
A clear, viscid lubricating fluid secreted by membranes in joint cavities, sheaths of tendons, and bursae.
[New Latin, coined by Paracelsus.]
synovial syn·o'vi·al adj.
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.