Examples: cartography card archaeology archetype monarchy legal loyal purse personal cinema kinase car carpenter hippopotamus Mesopotamia dative data date
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Icelandic siður
Old English sidu (cognate)
German Sitte (cognate)
Faroese siður (cognate)
Proto-Germanic *siduz (inherited)
Old High German situ (cognate)
Gothic 𐍃𐌹𐌳𐌿𐍃 (cognate)
Ancient Greek ἦθος (cognate)
Proto-Indo-European *swe-dh- (derived)
Old Norse siðr (inherited)
Swedish sed (cognate)

Icelandic venja (link)
Icelandic siðvenja (compound)
Icelandic sinn er siður í landi hverju (mention)
Icelandic mannasiður (mention)
Icelandic helgisiður (affix)
Luxembourgish Sitt (cognate)