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 ?
This project is aimed to get the channel accommodate more water or tidal wave which often hit Kapuk area.
A tidal wave of over two metres flooded parts of Jakarta overnight as the city government and citizens raced to hold the water back with emergency embankments, a government official said.
Instead of trying to hold back the tidal wave of public and political support for the mayor's plan, the school board should embrace progress -- unless, of course, the members care more about themselves than the kids.
Christ's first action is to raise from their tombs Adam and Eve, our ancestors whose unfortunate choices unleashed a tidal wave of disaster.
A YEAR AFTER THE killer waves hit the Indian shore killing 10,749 and leaving 5,640 missing, another wave is devastating the poorest Christians in these parts: the tidal wave of religious discrimination.
The Arkansas Democrat-Gazette's copy desk has tsaid tso long to the word tsunami and replaced it with the term tidal wave in stories about the recent natural disaster.
Examiner readers were today urged to dig deep to help the victims of the Asian tidal wave horror.
After the first tidal wave hit, only three of the 15 villas remained standing.
26 Kyodo - At least 497 people were killed Sunday in Indonesia's Sumatra Island after a major earthquake off the island triggered a tidal wave, local military, government and hospital officials said.
The executive director of Cultivation Ministries, a non-profit corporation that supports adult and teen leaders among Catholic youth ministries, presents Make It Real: A Practical Resource for Teen-Friendly Evangelization, a straightforward guide for Catholic evangelists seeking to compete for teenager's attention agains the tidal wave of popular culture.
Nor does China, which fears a human tidal wave across the Yalu River.
My remarks were aimed at the tidal wave of Anglo-American culture which is threatening to swamp Wales and the world.