From Middle English is, from Old English īs, from Proto-West Germanic *īs, from Proto-Germanic *īsą from Proto-Indo-European *h₁eyH-.
See also West Frisian iis, Dutch ijs, German Low German Ies, German Eis, Danish, Swedish Norwegian is); also Lithuanian ynis ("glazed frost"), Russian и́ней ("hoarfrost"), Ossetian их, ех, Persian یخ, Northern Kurdish qeş.
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