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| axis |
An axis is a real or imaginary line through the center of an object. The axis stays still while the object turns around it. |
| gyroscope |
an instrument with a turning wheel, mounted on an axis that can turn in any direction. When the axis turns, the wheel stays level. Gyroscopes are used to help keep ships and airplanes on course. |
| North Pole |
the point on the earth's surface that is farthest north. The North Pole is intersected by the northern end of the earth's axis. |
| pole2 |
either end of a planet's, moon's, or star's axis. [1/2 definitions] |
| revolution |
the action of turning or spinning on an axis. [1/4 definitions] |
| rotary |
turning or able to turn on an axis. [2 definitions] |
| rotate |
to cause to turn around on an axis. [1/4 definitions] |
| South Pole |
the point on the earth's surface that is farthest south. The South Pole is intersected by the southern end of the earth's axis. |
| spin |
to cause to turn quickly on an axis or as if on an axis. [1/8 definitions] |
| swing |
to cause to move back and forth around a point or on an axis. [2/10 definitions] |
| whirlwind |
a small storm in which a column of air turns rapidly around a central axis as the storm moves forward. Tornadoes are whirlwinds. [1/3 definitions] |
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