1A wave of water.
2Specifically. A wave in a large body of water, especially a sea, caused by a tectonic or geological disturbance such as an earthquake, or by an explosion.
3US A wave formed in hair by wetting it with water and shaping it, especially by using rollers.
Mid 16th century; earliest use found in Miles Coverdale (1488–1569), Bible translator and bishop of Exeter. From water + wave.