As defined by A Concise Dictionary of Old Icelandic (Geir Zoëga):
- (að), v. to affirm by oath on the book (Gospel); bókaðr eiðr = bókareiðr.
Possible runic inscription in Younger Futhark:ᛒᚢᚴᛅ
Also available in related dictionaries:
This headword also appears in dictionaries of other languages closely related to Old Icelandic.