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Latin radius
← Ancient Greek ἄρδις (derived)
← Proto-Indo-European *neredʰ- (derived)
← Proto-Indo-European *reh₁t- (derived)
← Latin rādīx (mention)
← Latin rāmus (mention)
← Sanskrit वर्धते (mention)

→ English ray (derived)
→ English race (mention)
→ English radius (borrowed)
→ English radiate (mention)
→ English radio- (mention)
→ English radiole (derived)
→ English radialis (derived)
→ Aragonese rayo (inherited)
→ Catalan radi (borrowed)
→ Catalan raig (inherited)
→ Catalan ratlla (derived)
→ Crimean Tatar radius (borrowed)
→ Crimean Tatar radiy (derived)
→ Czech radián (derived)
→ Welsh rhaidd (derived)
→ Danish radius (borrowed)
→ German Radius (borrowed)
→ Dalmatian rus (inherited)
→ Greek ράδιο (mention)
→ Spanish radio (borrowed)
→ Spanish raza (inherited)
→ Spanish raya (inherited)
→ Spanish rayo (inherited)
→ Spanish radián (derived)
→ French radian (derived)
→ French radius (borrowed)
→ French rai (inherited)
→ Friulian rai (inherited)
→ Irish raidió (derived)
→ Galician radio (borrowed)
→ Galician raza (derived)
→ Galician radial (derived(gl/en))
→ Galician raio (inherited)
→ Galician raíña (derived)
→ Galician raia (inherited)
→ Galician raxo (inherited)
→ Hebrew רדיוס (borrowed)
→ Hungarian radio- (derived)
→ Hungarian sugár (mention)
→ Indonesian radio (derived)
→ Indonesian radius (learned borrowing)
→ Italian radio (borrowed)
→ Italian raggio (inherited)
→ Italian razzo (inherited)
→ Italian razza (derived)
→ Italian radiante (derived)
→ Italian irraggiamento (derived)