K5Print Free printable worksheets for K–5

radius

  • noun
  • ra·di·us
  • rā'-dē-əs

The long bone in the forearm, on the side of the thumb.

Other meanings

  1. The lighter bone (or fused portion of bone) in the forelimb of an animal.

  2. One of the major veins of the insect wing, between the subcosta and the media; the vein running along the costal edge of the discal cell.

Related words

  • atomic radius
  • Bohr radius
  • covalent radius
  • blast radius
  • distal radius
  • Debye radius
  • Earth radius
  • Einstein radius
  • Hill radius
  • hydraulic radius
  • ionic radius
  • Roche radius

Example sentences

  • “What is the radius of a hydrogen atom?”

    Tatoeba · Miktsoanit · CC0

Where this comes from

This definition is adapted from “radius” on Wiktionary, by its contributors; example sentences are from Tatoeba, credited to their authors above, published under CC BY-SA 4.0. This page is published under the same licence.