radius.
radius:
Meaning & usage
radius: a line segment between any point of a circle or sphere and its center; the length of this line segment
radius: the long bone in the forearm, on the side of the thumb
area of a circle, commonly with epicenter as center
Where this word comes from
Learned borrowing from Latin radius.
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.