An effusion of serous fluid into a joint cavity.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Examples from the Web for hydrarthrosis
Historical Examples of hydrarthrosis
When the affection is of long standing and the joint is much distended it may be termed hydrops articuli or hydrarthrosis.Surgery, with Special Reference to Podiatry