inradius

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noun

the radius of the largest circle that will fit inside any given geometric shape, especially inside a regular polygon

OriginEnglish radius ← Middle English in- ← Old English in- →
Scrabble 9
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Meanings

nouninradius (plural inradii)

plural inradii

  1. mathematicsthe radius of the largest circle that will fit inside any given geometric shape, especially inside a regular polygon
  2. mathematicsthe radius of the largest sphere that will fit inside any given polyhedron

Origin

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

From in- + radius.

Full word history & related roots →
Cite this entry
APA

inradius. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/inradius

MLA

“inradius.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/inradius. Accessed November 3, 2026.

Chicago

WatkinsX Dictionary, s.v. “inradius,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/inradius.

Source: inradius on Wiktionary, CC BY-SA 4.0.