speed(redirected from speed of light)
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Related to speed of light: light year, E=mc2
The magnitude of velocity without regard to direction. Compare: velocity.
Slang A stimulant drug, especially amphetamine or methamphetamine.
v. sped (spĕd) or speeded, speeding, speeds
Slang To be under the influence of a stimulant drug.
Etymology: AS, spedan, to hasten
1 the rate of change of position with time. Compare velocity.
2 See amphetamines.
3 a reciprocal of the amount of radiation used to produce an image with various components of an x-ray imaging system, such as screens, film, and image intensifiers. There is often a tradeoff between radiation dose to the patient and the overall image quality. Thus a system using little radiation is "fast," whereas one requiring more radiation is "slow."
4 the amount of exposure of film to light or x-rays needed to produce a desired image. X-ray film speed usually is indicated as the reciprocal of the exposure in roentgens necessary to produce a density of 1 above the base and fog levels. See also fogged film fault.
Vox populi Rapidity of movement
SPEEDCardiology A clinical trial–Strategies for Patency Enhancement in the Emergency Department
speedDrug slang A street synonym for amphetamine, which may also refer to methamphetamine and crack
The magnitude of velocity without regard to direction.
speedthe change of distance with respect to time. A scalar quantity (i.e. having no directional component). linear speed is usually measured in metres per second (m.s-1), kilometres per hour (km.h-1) or miles per hour (mph), and angular speed in degrees per second (°.s-1) or radians per second (rad.s-1) See also velocity.
n the relative rapidity of action; rate of motion.
n See film speed.
n a relatively great rapidity of motion. In cavity preparations, rotary instruments are classified according to the number of revolutions per minute (rpm) made by the cutting tool. Designation of each speed range presently varies. In general, conventional speed is 10,000 to 60,000 rpm, high speed is 60,000 to 100,000 rpm, and ultrahigh speed is more than 100,000 rpm. May also be used to describe an evacuation system.
speed of light,
n a speed of 186,300 miles/sec.
speed of radiation,
n See radiation, speed of.