Þíðr

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

þíðr

a. not ice-bound, thawed (ísum þakt eða þítt); meðan áin er þíð, whilst the river is open.

Possible runic inscription in Younger Futhark:ᚦᛁᚦᚱ

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