Þingfastr

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

þingfastr

a. belonging, to a certain county (þing).

Possible runic inscription in Younger Futhark:ᚦᛁᚾᚴᚠᛅᛋᛏᚱ

Also available in related dictionaries:

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

• Old Norse - Cleasby & Vigfusson Dictionary