Radius

Pronunciation

• IPA: /ˈɹeɪdiÉ™s/
• Rhymes: -eɪdiÉ™s
• Hyphenation: ra + di + us

Origin

From Latin radius ("ray")

Full definition of radius

Noun

1. (anatomy) The long bone in the forearm, on the side of the thumb.
2. (zoology) The lighter bone (or fused portion of bone) in the forelimb of an animal.
3. (geometry) A line segment between any point on the circumference of a circle and its center/centre.
4. (geometry) The length of this line segment.

Related terms

• radial
• radiate, radiation

Anagrams

• Darius