As defined by A Concise Dictionary of Old Icelandic (Geir Zoëga):
- (gen. íss, pl. ísar), m. ice; ísa (acc.) leggr á vötn, the lakes (rivers) freeze over; ísa leysir, tekr af vötnum, the ice thaws, breaks up.
Possible runic inscription in Younger Futhark:ᛁᛋᛋ
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This headword also appears in dictionaries of other languages closely related to Old Icelandic.