diameter

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“
Inscribed triangles in a circle that have one side as the diameter are always right-angled, and tangents touching the circle at one point only are always perpendicular to the radius at that point. \%

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Definitions (22)

Toggle American Heritage definitions American Heritage Dictionary (4)

  1. noun Mathematics A straight line segment passing through the center of a figure, especially of a circle or sphere, and terminating at the periphery.
  2. noun Mathematics The length of such a segment.
  3. noun Thickness or width.
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Examples (50)

  • Earth's diameter is about 400 kilometers larger, but essentially the same size. —  Al Gore's new thinking on the climate crisis
  • This asteroid was about 10 to 12 km in diameter, which is large, but less than 0.2\% the diameter of the Earth.
  • We all believe that the ratio of the circumference of the circle to the diameter is approximately 3 .141 59, but I do not see how this belief could exist in the absence of language. —  My Philosophical Development
  • • Complete-link • also called the diameter or maximum method • longest distance from any member of one cluster to any member of the other cluster. —  Recently Uploaded Slideshows
  • Put another way, their diameter is about 1 / 50 th of a human hair; length is about 10 hair-widths. —  All DN headlines
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Etymologies (2)

Toggle American Heritage etymologies American Heritage Dictionary (1)

  1. Middle English diametre, from Old French, from Latin diametrus, from Greek diametros (grammē), diagonal (line) : dia-, dia- + metron, measure; see mē-2 in Indo-European roots.

Toggle Century etymologies Century Dictionary (1)

  1. from Middle English diametre = D.G. Danish Swedish diameter, from Old French diametre, French diamètre = Spanish diámetro = Portuguese Italian diametro, from Latin diametros, from . Greek διάμετρος, the diagonal of a parallelogram, diameter of a circle (cf. διαμετρείν, measure through), from διά, through, + μέτρον, a measure: see meter.
 

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/daɪˈæmɛtər/
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