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English

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

Crimean Tatar

Borrowed from Latin radius.

Danish

Borrowed from Latin radius.

French

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

Latin

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).

Norwegian Bokmål

Borrowed from Latin radius.

Norwegian Nynorsk

Borrowed from Latin radius.

Romanian

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