Skater \Skat"er\, n.

1. One who skates.

2. (Zo["o]l.) Any one of numerous species of hemipterous insects belonging to Gerris, Pyrrhocoris, Prostemma, and allied genera. They have long legs, and run rapidly over the surface of the water, as if skating.

Source: Webster's Revised Unabridged Dictionary (1913)