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In page Grimm's law:

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Examples with following *t:

  • Icelandic nótt [nouht] comes from Old Norse nǫ́tt, nátt, from Proto-Germanic *naht-. The Germanic *ht regularly becomes Old Norse tt, and this then becomes preaspirated in Icelandic. Thus, the [h] of the modern Icelandic form is not Germanic /h/'s direct descendant. The same ancestry holds for Icelandic átta's /tt/ as well.[citation needed]