radius

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“
In the larger of the two circles it is plain that the planet must be moving twice as rapidly as in the smaller, therefore its momentum is twice as great; and as the radius is also double, it follows that the moment of momentum in the large orbit will be four times that in the small orbit.

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Definitions (56)

Toggle American Heritage definitions American Heritage Dictionary (9)

  1. noun Mathematics A line segment that joins the center of a circle with any point on its circumference.
  2. noun Mathematics A line segment that joins the center of a sphere with any point on its surface.
  3. noun Mathematics A line segment that joins the center of a regular polygon with any of its vertices.
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Examples (50)

  • "Most sign companies conduct their business within a 30 miles radius, and I couldn't handle the long-distance requests as affordably or easily as their own local sign company could have," he says. —  thecookscottage
  • Earth's radius is about 6365 km, so Earth intercepts ~1. 27E17 J / s. —  RealClimate
  • Regional transportation officials recently took a survey of charter bus companies within a 1,000-mile radius of Washington and determined that about 10,000 of the 25,000 buses within the radius will be in the District on Inauguration Day. —  Black America Web
  • If you somehow crush that mass below that radius, a black hole forms. —  Alex Jones' Prison Planet.com
  • Come to find out Ticketmaster had put up notice that if you lived outside 75 miles of Cleveland and your order was paid for with a credit card that noted a billing address outside of the radius, your tickets will be automatically canceled!
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Etymologies (2)

Toggle American Heritage etymologies American Heritage Dictionary (1)

  1. Latin, ray, spoke of a wheel, radius.

Toggle Century etymologies Century Dictionary (1)

  1. from Latin radius, a staff, rod, spoke of a wheel, a measuring-rod, a semidiameter of a circle (as it were a spoke of the wheel), a shuttle, spur of a bird, sting of a fish, the radius of the arm; by transfer, a beam of light, a ray. Cf. ray (a doublet of radius) and the derived radiant, radiate, irradiate, etc.
 

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/ˈreɪdɪəs/
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