Þrumu-steinn

Meaning of Old Norse word "þrumu-steinn"

As defined by the Cleasby & Vigfusson Old Norse to English dictionary:

þrumu-steinn

m. a thunder-stone, in popular superstition.

Possible runic inscription in Younger Futhark:ᚦᚱᚢᛘᚢ-ᛋᛏᛁᛁᚾᚾ
Younger Futhark runes were used from 8th to 12th centuries in Scandinavia and their overseas settlements