tacho-, tach-, tachy-

(Greek: fast, speed, swift, rapid)

pneotachy (s) (noun), pneotachies (pl)
A fast rate of respiration: When seeing Dr. Small, Jenny was told that she had a case of pneotachy, which meant that she breathed in and out at a more rapid pace than normal.
sphygmotachy (s) (noun), sphygmotachies (pl)
The rate of the pulse.
A process contributing to the postgastrectomy syndrome in which food rapidly enters the small intestine via a gastroenterostomy.
tachistesthesia (s) (noun), tachistesthesias (pl)
The recognition of intermittency of illumination; flicker perception: Jennifer avoids going to popular clubs which use strobe lighting, because her tachistesthesia tends to trigger nausea.
tachistoscope, tachistoscopic, tachistoscopically
1. A scientific instrument used by psychologists which presents visual stimuli for a fraction-of-second exposures.
2. An apparatus that projects a series of images onto a screen at rapid speed to test visual perception, memory, and learning.
3. An instrument by means of which objects may be presented to the eyes for a brief measured period, a fraction of a second.

One of its principal applications being the measurement of the span of apprehension; that is, the amount of detail that can be apprehended by a single act of attention or perception.

1. A record in graph form produced by a tachograph.
2. In medicine, a graphic record of the movement and velocity of the blood current.
tachograph, tachography
1. An instrument that produces a record of the use and reading of a tachometer, especially one in a commercial vehicle or bus recording speeds and distances traveled. Essentially, a tachograph records the hours worked by a driver.
2. In medicine, the recording of the speed of the blood current.
tachometer, tachometry
A device used to determine the speed of rotation, typically of a vehicle’s crankshaft and usually in revolutions per minute. Also known as a "speedometer".
A medical condition in which the hearbeat is fast and irregular.
1. The disproportionately rapid growth of an organ or region as compared with the growth of the remainder of the body.
2. A situation in which a part grows more rapidly than the whole.
tachycardia, tachycardiac, tachycardic, tachyrhythmia
An excessively rapid heartbeat, typically regarded as a heart rate exceeding 100 beats per minute in a resting adult.
tachycinesis, tachycinetic, tachykinesis, tachykinetic
Moving rapidly.
A reference to or characterized by a rapid pulse.
An abnormal heart rhythm with a rate greater than 100 beats per minute in an adult; the term tachyarrhythmia is usually used instead.
tachygenesis, tachygenetic
1. In medicine, the acceleration and compression of ancestral stages in embryonic development.
2. The sudden appearance of an organ in evolution; the part so appearing.