As defined by A Concise Dictionary of Old Icelandic (Geir Zoëga):
- (dat. sumri, pl. sumur), n. summer; um ~it, in the course of the summer, during the summer; at sumri, next summer; mitt s., midsummer; í s., this summer.
Possible runic inscription in Younger Futhark:ᛋᚢᛘᛅᚱ
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This headword also appears in dictionaries of other languages closely related to Old Icelandic.