Skates are things you wear on your feet so you can roll around a roller rink or glide across an icy pond. Roller skates have wheels on the bottom, and ice skates have metal blades.
When you lace up your skates and start moving over the ice, you skate. You also skate when you head down the street to your friend's house on your skates—or on your skateboard. A totally different kind of skate is the sea creature that looks like a sting ray, with a wide, flat body. The sporting equipment kind of skate comes from a Germanic root meaning "thing that shakes or moves fast."