n."stiffness of joints," 1713, from Greek ankylos "crooked" (see angle (n.)) + -osis. if (window.googletag) {googletag.cmd.push(function() { googletag.display('dcomMobileSERPDisplayTopAd-300x250'); });} else {console.error('googletag not defined, dcomMobileSERPDisplayTopAd-300x250');}