radius

English Online Dictionary. What means radius‎? What does radius mean?

English

Etymology

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

Pronunciation

• enPR: rā'-dē-əs, IPA^(key): /ˈɹeɪ.di.əs/
• Rhymes: -eɪdiəs
• Hyphenation: ra‧di‧us

Noun

radius (plural radii or radiuses)

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. (entomology) One of the major veins of the insect wing, between the subcosta and the media
4. (geometry) A line segment between any point of a circle or sphere and its center.
5. (geometry) The length of this line segment.
6. Anything resembling a radius, such as the spoke of a wheel, the movable arm of a sextant, or one of the radiating lines of a spider's web.

Synonyms

• (vein of insect wing): R

Related terms

• radial
• radiate, radiation

Translations

See also

• ulna
• semidiameter
• Radius (bone) on Wikipedia.Wikipedia

Anagrams

• Darius

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Crimean Tatar

Etymology

Borrowed from Latin radius.

Noun

radius

1. radius (line segment or length of this line segment)

Declension

References

• Mirjejev, V. A.; Usejinov, S. M. (2002) Ukrajinsʹko-krymsʹkotatarsʹkyj slovnyk [Ukrainian – Crimean Tatar Dictionary]‎^[1], Simferopol: Dolya, →ISBN

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Danish

Etymology

Borrowed from Latin radius.

Noun

radius c (singular definite radien or radiusen, plural indefinite radier or radiuser)

1. (geometry) radius

References

• “radius” in Den Danske Ordbog

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Esperanto

Verb

radius

1. conditional of radii

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French

Etymology

Borrowed from Latin radius. Doublet of rai, which was inherited.

Pronunciation

• IPA^(key): /ʁa.djys/

Noun

radius m (plural radius)

1. (anatomy) radius

Further reading

• “radius” in le Trésor de la langue française informatisé (The Digitized Treasury of the French Language).

Anagrams

• durais

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Ido

Verb

radius

1. conditional of radiar

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Latin

Etymology

Of uncertain origin. Some have tried to connect it to rādīx. Tucker suggests Proto-Indo-European *neredʰ- (“extend forth, rise, outward”) akin to Sanskrit वर्धते (vardhate, “rise, grow”), or from Ancient Greek ἄρδις (árdis, “sharp point”). May ultimately be from Proto-Indo-European *reh₁t- (“bar, beam, stem”).

Pronunciation

• (Classical) IPA^(key): /ˈra.di.us/, [ˈra.di.ʊs]

Noun

radius m (genitive radiī or radī); second declension

1. ray (of light)
2. staff, rod
3. spoke (of a wheel)

Declension

Second-declension noun.

¹Found in older Latin (until the Augustan Age).

Derived terms

• radiō

Descendants

References

• radius in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
• radius in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers
• radius in Charles du Fresne du Cange’s Glossarium Mediæ et Infimæ Latinitatis (augmented edition, 1883–1887)
• radius in Gaffiot, Félix (1934) Dictionnaire Illustré Latin-Français, Hachette
• radius in Harry Thurston Peck, editor (1898) Harper's Dictionary of Classical Antiquities, New York: Harper & Brothers
• radius in William Smith et al., editor (1890) A Dictionary of Greek and Roman Antiquities, London: William Wayte. G. E. Marindin

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Norwegian Bokmål

Etymology

Borrowed from Latin radius.

Noun

radius m (definite singular radien or radiusen, indefinite plural radier, definite plural radiene)

1. (geometry) radius

References

• “radius” in The Bokmål Dictionary.

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Norwegian Nynorsk

Etymology

Borrowed from Latin radius.

Noun

radius m (definite singular radiusen, indefinite plural radiusar, definite plural radiusane)

1. (geometry) radius

References

• “radius” in The Nynorsk Dictionary.

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Romanian

Etymology

Borrowed from French radius, Latin radius. Compare the inherited doublet rază (“ray”).

Noun

radius n (plural radiusuri)

1. (anatomy) radius (bone)

Related terms

• radiu