As defined by A Concise Dictionary of Old Icelandic (Geir Zoëga):
- annarr hvárr
- indef. pron., one or other of two persons, either (drepa annan hvárn þeirra sona Skallagríms); at öðru hváru, every now and then, aðrir hvárir, one or other of the two parties; neut. used as adv., annat hvárt … eða, either … or.
Possible runic inscription in Younger Futhark:ᛅᚾᚾᛅᚱᚱ:ᚼᚢᛅᚱᚱ
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This headword also appears in dictionaries of other languages closely related to Old Icelandic.