Atrið

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

atrið

n. movement; hann hafði allt eitt ~it, he did both things at once.

Possible runic inscription in Younger Futhark:ᛅᛏᚱᛁᚦ

Also available in related dictionaries:

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

• Old Norse - Cleasby & Vigfusson Dictionary