Etymology

radius

ra·di·us
R1A1D2I1U1S1

Today it means: The long bone in the forearm, on the side of the thumb. Full definition →

Latin radius
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The story

  1. Latin · borrowed fromradius“ray”
  2. English todayradius

Borrowed from Latin radius (“ray”). Doublet of ray.

Words from the same roots

Latinradius all →

rayradialrayonradialisradio-radiole

Etymology from Wiktionary, CC BY-SA 4.0.