glid·der I. \ˈglidə(r)\transitive verb (-ed/-ing/-s) Etymology: obsolete glidder, adjective, slippery, from (assumed) Middle English glidder, from Old English glidder, glider; akin to Old English glīdan to glide dialect England: to glaze over (as with ice) II. noun (-s) Etymology: from or akin to obsolete glidder, adjective dialect Britain: a loose stone (as on a hillside)