Blóðnætr

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

blóðnætr

f. pl. ‘blood-nights’, in the prov., ‘~ eru hverjum bráðastar’, referring to the fierce desire to revenge a homicide newly committed.

Possible runic inscription in Younger Futhark:ᛒᛚᚢᚦᚾᛅᛏᚱ

Also available in related dictionaries:

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

• Old Norse - Cleasby & Vigfusson Dictionary