bow wave

[bou]

bow wave

[bou]
noun
1.
the wave generated on either side of a vessel's bow by its forward movement through the water.
2.
a type of shock wave formed in front of a body moving at supersonic speed.

Origin:
1875–80
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Bow wave is always a great word to know.
So is slumgullion. Does it mean:
a stew of meat, vegetables, potatoes, etc.
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
Encyclopedia Britannica
Encyclopedia

bow wave

progressive disturbance propagated through a fluid such as water or air as the result of displacement by the foremost point of an object moving through it at a speed greater than the speed of a wave moving across the water. Viewed from above, the crest of the bow wave of a moving ship is V-shaped; the angle of the V is determined by the relative speeds of the ship and of the propagation of waves in the water.In three-dimensional space-for example, when describing the wave produced by a plane flying at supersonic speed-the bow wave is conical in shape. In this case an observer on the ground experiences a sonic boom when the bow wave passes. See also wave motion.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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