Aftereffect of hair perm

WordNet Word definitions in WordNet
n. a region of high pressure travelling through a gas at a high velocity; "the explosion created a shock wave" [syn: blast wave ]

Wikipedia Word definitions in Wikipedia
In physics, a shock wave (also spelled shockwave ), or shock , is a type of propagating disturbance. When a wave moves faster than the local speed of sound in a fluid it is a shock wave. Like an ordinary wave, a shock wave carries energy, and can propagate ...

Wiktionary Word definitions in Wiktionary
n. 1 (context physics English) A powerful compression wave produced by the movement of a body through a fluid or gas at a velocity greater than the local speed of sound. 2 Any violent disturbance.

Longman Dictionary of Contemporary English Word definitions in Longman Dictionary of Contemporary English
noun EXAMPLES FROM CORPUS ▪ How do we prepare for the next shock wave ? ▪ The shock wave was felt even in my plane, several miles away from the harbor. ▪ The higher entry speed experienced by a ship returning from the Moon would generate a shock wave in ...