Origin: altered < ME sliper, slippery < OE slipor, akin to MHG slupferic: for IE base see slip
See slippery in American Heritage Dictionary 4
adjective slip·per·i·er, slip·per·i·est
Origin: Alteration of obsolete slipper
Origin: , from Middle English
Origin: , from Old English slipor; see lei- in Indo-European roots.
Learn more about slippery