As defined by the Cleasby & Vigfusson Old Norse to English dictionary:
- bil-röst (bil-rǫst)
- f. via tremula, the rainbow, v. bifröst.
Orthography: The Cleasby & Vigfusson book used letter ö to represent the original Old Norse vowel ǫ. Therefore, bil-röst may be more accurately written as bil-rǫst.
Possible runic inscription in Younger Futhark:ᛒᛁᛚ-ᚱᚢᛋᛏ
Younger Futhark runes were used from 8th to 12th centuries in Scandinavia and their overseas settlements