siðr

From Proto-Germanic *siduz, from Proto-Indo-European *swedʰ- (“custom, habit”). Cognate to Old English sidu (“a custom; a manner; a rite; purity”), Old High German situ (“a custom, a habit”) (whence German Sitte), Gothic 𐍃𐌹𐌳𐌿𐍃 (sidus), Ancient Greek ἦθος (êthos).

siðr m

1. a custom, a habit
2. a conduct, morality, religion

• Icelandic: siður
• Faroese: siður
• Norwegian: sed
• Jamtish: sið
• Old Swedish: siþer, sedher
  • Swedish: sed
• Danish: sæd

• Zoëga, Geir T. (1910) “http://www.northvegr.org/zoega/h358.php”, in A Concise Dictionary of Old Icelandic, Oxford: Clarendon Press; also available at the Internet Archive