Hrossíss

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

hrossíss

m. ice that is strong enough to ride on.

Possible runic inscription in Younger Futhark:ᚼᚱᚢᛋᛋᛁᛋᛋ

Also available in related dictionaries:

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

• Old Norwegian - Johan Fritzner's Dictionary