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Old Norse word reykr comes from Proto-Indo-European *ru-, Proto-Indo-European *rowgi-, and later Proto-Germanic *raukiz (Smoke, vapour.)
*ru- (Proto-Indo-European)
*rowgi- (Proto-Indo-European)
*rewg- (Proto-Indo-European)
*raukiz (Proto-Germanic)
Smoke, vapour.
reykr (Old Norse)
Smoke.