Plural of radius
irregular plural
The plural of radius is radii or radiuses.
Forms of radius
| Singular | radius /ˈɹeɪ.di.əs/ |
|---|---|
| Plural | radii /ˈɹeɪ.di.aɪ/ radiuses |
| Countable | countable |
Radii and radiuses in a sentence
- The radius vector of a periplegmatic curve is of length between the radii of the two spheres.1972, Yusuke Hagihara, Celestial Mechanics: Perturbation Theory, MIT Press. From the entry diastem
- The cranes are supplied with outriggers and jacks for use when lifting heavy loads or when working at extended radii.1960 July, “Talking of Trains: New breakdown cranes”, in Trains Illustrated, page 392. From the entry outrigger
- Accordingly, the report advised that middle and higher-socioeconomic-strata neighborhoods should not fall at least within the one-mile and five-mile radii of the proposed site.2002, Eileen Guana, Essay on Environmental Justice: The Past, the Present, and Back to the Future, page 17. From the entry socio-economic
- The web of gasteracanthines is a complete orb, made either vertically or on an inclined plane, with an open hub, many radii and viscid spirals.1997, Ansie S. Dippenaar-Schoeman, African spiders: an identification manual, page 113. From the entry gasteracanthine
- The radii of gyration parallel and perpendicular to the director are obtained from macroscopically aligned samples by using a two-dimensional detection method.1989, Christine Boeffel, Hans Wolfgang Spiess, “8: NMR methods for studying molecular order and motion in liquid crystalline side group…. From the entry radius of gyration
Meaning of radius
- noun The long bone in the forearm, on the side of the thumb.
- noun The lighter bone (or fused portion of bone) in the forelimb of an animal.
- noun One of the major veins of the insect wing, between the subcosta and the media; the vein running along the costal edge of the discal cell.
Nouns ending in -us: plural -i
Questions about the plural of radius
- What is the plural of radius?
- The plural of radius is radii or radiuses.
- Which is correct, radii or radiuses?
- Both are used. radii is the more common of the two in English writing.
- Is radius countable?
- Radius is a countable noun.
Source and license
Adapted from Wiktionary: radius (page history and authors) and the entries of its forms. Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws left out forms marked obsolete, archaic, rare or dialectal and added the examples. Wiktionary data of 2026-09-02.
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Cite this page: “Plural of radius.” Word.ws, https://word.ws/plural/radius. Based on Wiktionary, CC BY-SA 4.0.