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definition of the word radius

by the Wiktionnary

Latin radius, ‘ray’.

Singular
radius

Plural
radii or radiuses

radius (plural radii or radiuses)

  1. (anatomy) The long bone in the forearm, on the side of the thumb.
  2. (geometry) A line segment between any point on the circumference of a circle and its center/centre.
  3. (geometry) The length of this line segment.


Definition from Wiktionary
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