Þrek

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

þrek

n., poet., pith, strength, courage, daring (eigi hófum ver þrek til at berjast við Þorstein) hafa þrek við e-m, to be a match for.

Possible runic inscription in Younger Futhark:ᚦᚱᛁᚴ

Also available in related dictionaries:

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

• Old Norse - Cleasby & Vigfusson Dictionary
• Old Norwegian - Johan Fritzner's Dictionary