circumradius

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noun

For a given geometric shape, the radius of the smallest circle or sphere into which it will fit.

“The circumradius of the unit square is one-half the square root of two.”

OriginEnglish radius ← Latin circum- ← Ancient Greek κίρκος (kírkos) →
Scrabble 19
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Meanings

nouncircumradius (plural circumradii)

plural circumradii

  1. mathematicsFor a given geometric shape, the radius of the smallest circle or sphere into which it will fit.

    The circumradius of the unit square is one-half the square root of two.

Origin

  1. Ancient Greekκίρκος (kírkos)
  2. Latincircus
  3. Latincircum
  4. Latincircum-
  5. Englishcircum-
  6. Englishradius
  7. Englishcircumradius

From circum- + radius.

Full word history & related roots →
Cite this entry
APA

circumradius. (n.d.). In WatkinsX Dictionary. Retrieved November 2, 2026, from https://dictionary.watkinsx.com/word/circumradius

MLA

“circumradius.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/circumradius. Accessed November 2, 2026.

Chicago

WatkinsX Dictionary, s.v. “circumradius,” accessed November 2, 2026, https://dictionary.watkinsx.com/word/circumradius.

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