1. Acrobatic revolutions with the body turned sideways and the arms and legs outstretched like the spokes of a wheel.
2. Has wooden spokes and a metal rim.
3. A large coin (as a silver dollar)
4. A lateral handspring with arms and legs extended
ETYM French ycle, Late Lat. cyclus, from Greek kyklos ring or circle, cycle; akin to Skr. cakra wheel, circle. Related to Wheel.
1. A periodically repeated sequence of events.
2. A series of poems or songs on the same theme.
3. An interval during which a recurring sequence of events occurs; SYN. rhythm, round.
4. A single complete execution of a periodically repeated phenomenon.
In physics, a sequence of changes that moves a system away from, and then back to, its original state. An example is a vibration that moves a particle first in one direction and then in the opposite direction, with the particle returning to its original position at the end of the vibration.
Sinonimi: pulley-block | block
ETYM French poulie, perhaps of Teutonic origin.
A simple machine consisting of a wheel with a groove in which a rope can run to change the direction or point of application of a force applied to the rope; SYN. pulley-block, block.
Simple machine consisting of a fixed, grooved wheel, sometimes in a block, around which a rope or chain can be run. A simple pulley serves only to change the direction of the applied effort (as in a simple hoist for raising loads). The use of more than one pulley results in a mechanical advantage, so that a given effort can raise a heavier load.
The mechanical advantage depends on the arrangement of the pulleys. For instance, a block and tackle arrangement with three ropes supporting the load will lift it with one-third of the effort needed to lift it directly (if friction is ignored), giving a mechanical advantage of 3.
ETYM Latin vehiculum, from vehere to carry; akin to Eng. way, wain. Related to Way, Convex, Inveigh, Veil, Vex.
1. A conveyance that transports people or objects.
2. A medium for the expression or achievement of something.
ETYM Latin velox, -ocis, swift + pes, pedis, a foot. Related to Velocity, and Foot.
Any of several early bicycles with pedals on the front wheel.
Swift-footed; swift-footed person; old-fashioned bicycle.
ETYM Old Eng. wheel, hweol, AS. hweól, hweogul, hweowol; akin to Dutch wiel, Icel. hvęl, Greek kyklos, Skr. cakra; cf. Icel. hjôl, Dan. hiul, Swed. hjul. Related to Cycle, Cyclopedia.
1. A simple machine consisting of a circular frame with spokes (or a solid disc) that can rotate on a shaft or axle (as in vehicles or other machines).
2. A wheel used to control the rudder of a vessel.