tidal wave


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wave

 [wāv]
1. a uniformly advancing disturbance in which the parts undergo a change in direction, such as a progressing disturbance on the surface of a liquid.
2. variation in the transmission of electromagnetic energy, especially the periodic change in direction of a reading on a monitoring device.
A wave the wave on a His bundle electrogram that represents atrial activation.
alpha w's brain waves having a frequency of 8 to 13 per second, typical of a normal person awake in a quiet resting state; they occur primarily in the occipital region.
B wave a sharp rhythmic oscillation with a sawtooth pattern, occurring every 30 seconds to two minutes during intracranial pressure monitoring, associated with unstable increases in pressure.
beta w's brain waves having a frequency of 18 to 30 per second, typical during periods of intense central nervous system activity; they occur primarily in the parietal and frontal regions.
brain w's changes in electric potential of different areas of the brain, as recorded by electroencephalography. See also alpha, beta, delta, and theta waves.
C wave in intracranial pressure monitoring, a small rhythmic oscillation in pressure that occurs every four to eight minutes.
delta w's
1. brain waves having a frequency below 3½ per second, typical in deep sleep, in infancy, and in serious brain disorders.
2. an early QRS vector in the electrocardium in wolff-parkinson-white syndrome.
dicrotic wave the second portion of the tracing of a sphygmograph of the arterial pulse or arterial pressure after the dicrotic notch, attributed to the reflected impulse of closure of the aortic valves. Called also recoil wave
electromagnetic w's the entire series of ethereal waves, which are similar in character and move at the speed of light but vary enormously in wavelength. The unbroken series is known from radio waves that may be many kilometers in length through light waves, ultraviolet rays, x-rays, and gamma rays, to the cosmic rays, whose wavelength may be as short as 40 femtometers (4 × 10−14 m).
light w's the electromagnetic waves that produce sensations on the retina; see also vision.
P wave a positive deflection in the normal surface electrocardiogram produced by the wave of excitation passing over the atria; it represents atrial depolarization, an intrinsic atrial event.
papillary wave (percussion wave) the chief ascending portion of the tracing of a sphygmograph.
plateau wave a wave seen during intracranial pressure monitoring in advanced stages of increased pressure, signaling hypoxia of the brain cells.
pulse wave the elevation of the pulse felt by the finger or shown graphically in a recording of pulse pressure.
Q wave in the QRS complex, the initial electrocardiographic downward (negative) deflection, related to the initial phase of depolarization.
QRS wave QRS complex.
R wave in the normal surface electrocardiogram, the initial upward deflection of the QRS complex, following the Q wave; it represents ventricular depolarization. In cardiac pacing, it may be the entire native or intrinsic QRS complex.
radio w's electromagnetic waves of wavelength between 10−1 and 106 cm and frequency of about 1011 to 104 hertz.
recoil wave dicrotic wave.
S wave a downward deflection of the QRS complex following the R wave in the normal surface electrocardiogram.
sonic w's audible sound waves.
sound w's longitudinal waves of mechanical energy that transmit the vibrations interpreted as sound (def. 2).
T wave the second major deflection of the normal surface electrocardiogram, reflecting the potential variations occurring with repolarization of the ventricles.
theta w's brain waves having a frequency of 4 to 7 per second, occurring mainly in children but also seen in adults under emotional stress.
tidal wave the wave after the percussion wave on a sphygmograph recording; the second elevation of the tracing, preceding the dicrotic wave.
ultrasonic w's waves similar to sonic waves but of such high frequency (20,000 hertz or higher) that the human ear does not perceive them as sound; see ultrasonics.

ti·dal wave

the wave between the percussion wave and the dicrotic wave in the downward limb of the arterial pulse tracing.
An abrupt rise of tidal water—due to atmospheric or geological activities—which moves rapidly inland from the mouth of an estuary or from a coast, resulting in an extremely large wave sweeping in from the sea like a massive tide
Causes
(1) Undersea earthquakes, resulting in tsunamis—seismic sea waves
(2) Hurricanes, cyclones, or storms at sea, resulting in storm surge-type tidal waves
References in periodicals archive ?
Tidal waves also slammed into southern India on Sunday, killing about 1,000 people and causing extensive damage, Interior Minister Shivraj Patil reportedly said.
'Nigel said the tidal wave hit while she was standing outside the car.
So far only one Briton has been confirmed dead - a man on holiday in the Maldives died of a heart attack as the tidal wave struck, said a government official there.
SCOTS businessman Andy Croce described the carnage caused by the tidal waves.
Mr Shute said: "The water suddenly came like a tidal wave. It was about 2ft high."
'My remarks were aimed at the tidal wave of Anglo-American culture which is threatening to swamp Wales and the world.
This new series, exploring the damage caused by extreme weather conditions around the globe, begins with on-the-spot footage and eyewitness testimony to probe the destruction caused by tidal waves.
"When you compete, you need to focus on your strength," says Tewksbury, the 1992 Olympic backstroke champion who created a tidal wave of excitement when he came out in 1998.
The latest toll from Papua New Guinea's tidal wave last month has reached 2,134 dead, with 9,483 in care centers and 628 in hospitals, Papua New Guinea's Prime Minister Bill Skate said Monday.
THE true-life horrors wrought by the recent tidal wave in Papua New Guinea add an extra poignancy to this rather doomy exotic thriller set in that benighted isle where Frenchman Jack (Tcheky Karyo) seems to be living in a state of drunken remorse.
However, there are instances where a veritable tidal wave of evidence sweeps through the Court.
One of the bible-bashers then declares the programme to be a "tidal wave of filth".