a form of skate with four wheels or rollers instead of a runner, for use on a sidewalk or other surface offering traction.
Origin of roller skate
An Americanism dating back to 1860–65
verb (used without object), roll·er-skat·ed, roll·er-skat·ing.
Origin of roller-skate
First recorded in 1870–75; v. use of roller skate
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
a boot or shoe with four small wheels attached that enable the wearer to glide swiftly over a floor or other surface
a device having clamps or straps for attaching such wheels to a boot or shoe
(intr) to move on roller skates
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Online Etymology Dictionary, © 2010 Douglas Harper