köken: Inherited from Old East Slavic лучь (lučĭ), from Proto-Slavic *lučь (“ray; torch”), from Proto-Indo-European *lowkis, which is derived from *lewk-.
köken: From Middle Korean *가ᄫᆞᆯ (*kaWol), from Old Korean *kapol (*kapol) or perhaps *kapul (*kapul). First attested in Hangul form only in the seventeenth century, but regularly indirectly attested since the eighth century in Chinese-language texts produced in Korea in the phonogramic form 加火魚 /加火鱼 (jiāhuǒyú).
a staff, rod · a rod for measurement · the radius of a circle; a rotating radial arm
çekim: çoğul radiī · tamlayan radiī
köken: Of uncertain origin. Some connect it with rādīx and rāmus. 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”).
aile: radiō, radiolus
“… ubi prīmōs crāstinus ortus
At pater Hēliadum radiōs ubi tīnxerit undīs
Etimoloji
súg (“to whisper”) + -ár (noun-forming suffix). The verb súg is in origin an onomatopoeia corresponding to English rustle, so the original meaning of sugár may have been a rustling object. The several other current meanings are the result of a name transfer process. The geometry sense of radius was patterned after Latin, compare radius (“ray; staff, rod; spoke of a wheel”).