change-up
change-of-pace
change-of-pace ball
off-speed pitch | a baseball thrown with little velocity when the batter is expecting a fastball |
speed
speeding
hurrying | changing location rapidly |
| speed skating | competitive skating on speed skates (usually around an oval course) |
generation
multiplication propagation | the act of producing offspring or multiplying by such production |
amphetamine
pep pill
upper speed | a central nervous system stimulant that increases energy and decreases appetite, used to treat narcolepsy and some forms of depression |
| speed bump | a hindrance to speeding created by a crosswise ridge in the surface of a roadway |
speedometer
speed indicator | a meter fixed to a vehicle that measures and displays its speed |
speed skate
racing skate | an ice skate with a long blade, worn for racing |
speed
swiftness
fastness | a rate (usually rapid) at which something happens, the project advanced with gratifying speed |
| execution speed | (computer science) the speed with which a computational device can execute instructions, measured in MIPS |
| speed trap | a trap arranged on a roadway for catching speeders |
propagation
extension | the spreading of something (a belief or practice) into new regions |
| speed limit | regulation establishing the top speed permitted on a given road |
motorcycle cop
motorcycle policeman
speed cop | a policeman who rides a motorcycle (and who checks the speeds of motorists) |
speeder
speed demon | a driver who exceeds the safe speed limit |
| speed freak | addict who habitually uses stimulant drugs (especially amphetamines) |
speedskater
speed skater | an ice-skater who races competitively, usually around an oval course |
| angular velocity | (physics) the rate of change of the angular position of a rotating body, usually expressed in radians per second or radians per minute |
| propagation | the movement of a wave through a medium |
focal ratio
f number
stop number
speed | the ratio of the focal length to the diameter of a (camera) lens system |
high-speed steel
hot-work steel | an alloy steel that remains hard at a red heat, used to make metalutting tools |
speed
velocity | distance travelled per unit time |
| escape velocity | the minimum velocity needed to escape a gravitational field |
| muzzle velocity | the velocity of a projectile as it leaves the muzzle of a gun |
| peculiar velocity | velocity with respect to the local standard of rest |
| radial velocity | velocity along the line of sight toward or away from the observer |
speed of light
light speed
c | the speed at which light travels in a vacuum, the constancy and universality of the speed of light is recognized by defining it to be exactly ,, meters per second |
| terminal velocity | the constant maximum velocity reached by a body falling through the atmosphere under the attraction of gravity |
accelerate
speed up
speed
quicken | move faster, The car accelerated |
| accelerate speed speed up | cause to move faster, He accelerated the car |
| speed skate | race on skates |
travel rapidly
speed
hurry
zip | move very fast, The runner zipped past us at breakneck speed |
| speed | travel at an excessive or illegal velocity, I got a ticket for speeding |
c rush
hotfoot
hasten
hie
speed race
pelt along
rush along
cannonball along
bucket along
belt along
step on it | move fast, He rushed down the hall to receive his guests, The cars raced down the street |
| high-speed high-velocity | operating at high speed, a high-speed food processor, a high-velocity shell |