Þrevetr

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

þrevetr

a. three winters (or years) old (þeir vóru ~ir).

Possible runic inscription in Younger Futhark:ᚦᚱᛁᚢᛁᛏᚱ

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