Naðra

As defined by A Concise Dictionary of Old Icelandic (Geir Zoëga):

naðra

f. adder, snake (~ mikil ok illileg).

Possible runic inscription in Younger Futhark:ᚾᛅᚦᚱᛅ

Also available in related dictionaries:

This headword also appears in dictionaries of other languages closely related to Old Icelandic.

• Old Norwegian - Johan Fritzner's Dictionary