siður

From Old Norse siðr (“a custom, a habit; conduct, morality, religion”), from Proto-Germanic *siduz, from Proto-Indo-European *swe-dh-.

• Rhymes: -iː

siður m (genitive singular siðar, plural siðir)

1. tradition, custom

• sær er siður á landi

From Old Norse siðr (“a custom, a habit; conduct, morality, religion”), from Proto-Germanic *siduz, from Proto-Indo-European *swe-dh-. Cognate to Old English sidu (“a custom; a manner; a rite; purity”), Old High German situ (“a custom, a habit”) (whence the German Sitte), Faroese siður (“a tradition, a custom”), Swedish sed, Gothic 𐍃𐌹𐌳𐌿𐍃 (sidus), Ancient Greek ἦθος (êthos), from a Proto-Indo-European stem *swe-dh-.

• IPA^(key): /ˈsɪːðʏr/
• Rhymes: -ɪːðʏr

siður m (genitive singular siðar or (in certain expressions) siðs, nominative plural siðir)

1. custom, habit

   Synonym: venja

2. religion

   Synonym: trúarbrögð

• The genitive form siðs is used in set phrases, siðar should otherwise be used.
• The ancient plural accusative form siðu (“customs”) is sometimes used.

• vera til siðs, til siðs (“to be customary”)
• hafa til siðs
• í fornum sið (“in heathen times”)
• siðfesta
• sinn er siður í landi hverju (“when in Rome do as the Romans do”)

• Ásgeir Blöndal Magnússon (1989) Íslensk orðsifjabók, Reykjavík: Árni Magnússon Institute for Icelandic Studies, →ISBN (Available at Málið.is under the “Eldri orðabækur” tab.)
• Kristín Bjarnadóttir, editor (2002–2025), “siður”, in Beygingarlýsing íslensks nútímamáls [The Database of Modern Icelandic Inflection] (in Icelandic), Reykjavík: The Árni Magnússon Institute for Icelandic Studies
• Mörður Árnason (2019) Íslensk orðabók, 5th edition, Reykjavík: Forlagið
• “siður” in the Dictionary of Modern Icelandic (in Icelandic) and ISLEX (in the Nordic languages)
• “siður”, in Ritmálssafn Orðabókar Háskólans [The Written Collection of the Lexicological Institute] (in Icelandic), Reykjavík: The Árni Magnússon Institute for Icelandic Studies, (Can we date this quote?)