Etymology

inradius

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Today it means: the radius of the largest circle that will fit inside any given geometric shape, especially inside a regular polygon Full definition →

English radius ← Middle English in- ← Old English in-
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The story

  1. Proto-Indo-European*h₁én
  2. Proto-Germanic*in
  3. Old Englishin-
  4. Middle Englishin-
  5. Englishin-
  6. Englishradius
  7. English todayinradius

From in- + radius.

Etymology from Wiktionary, CC BY-SA 4.0.