noun · verb · 14 senses · updated from the 2026-07-25 local source snapshot
Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.
Sound
Pronunciation
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rā'-dē-əs
/ˈɹeɪ.di.əs/
US:Recorded audio is listed in the source snapshot.
rhymes with -eɪdiəs
CMU ARPABET:R EY1 D IY0 AH0 S
Digits mark lexical stress: 1 primary, 2 secondary, 0 unstressed.
1
noun
Meaning 1
The long bone in the forearm, on the side of the thumb.
Definition source: English Wiktionary via Wiktextract
Topics: anatomy, medicine, sciences
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
2
noun
Meaning 2
The lighter bone (or fused portion of bone) in the forelimb of an animal.
Definition source: English Wiktionary via Wiktextract
Topics: biology, natural-sciences, zoology
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
3
noun
Meaning 3
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.
Definition source: English Wiktionary via Wiktextract
Topics: biology, entomology, natural-sciences
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
4
noun
Meaning 4
A line segment between any point of a circle or sphere and its center.
Definition source: English Wiktionary via Wiktextract
Topics: geometry, mathematics, sciences
Examples
Fatima claims to have visited all the bars within a five-mile radius of her Manhattan apartment.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
5
noun
Meaning 5
The length of this line segment.
Definition source: English Wiktionary via Wiktextract
Topics: geometry, mathematics, sciences
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
6
noun
Meaning 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.
Definition source: English Wiktionary via Wiktextract
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
7
noun
Meaning 7
The minimum eccentricity of any vertex, for a given graph.
Definition source: English Wiktionary via Wiktextract
Topics: graph-theory, mathematics, sciences
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
8
noun
Meaning 8
Initialism of Remote Authentication Dial-In User Service.
Definition source: English Wiktionary via Wiktextract