Plural of eth, an Old English letter (ð) that represented the 'th' sound and is still used in modern Icelandic and Faroese.
From Old English æð, related to the name of the rune; the letter itself descended from the Latin letter D and the Elder Futhark rune dagaz.
Eth is one of the few Old English letters we still use today in modern Icelandic—when you see 'ð' in Icelandic names, you're reading a letter that's been in continuous use for over 1,500 years!
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