- orConnects at least two alternative words, phrases, clauses, sentences, etc., each of which could make a passage true.
- aurumGold (used in the names of various substances, see "Derived terms").
- aur-gold
- aurigraphyThe art of writing with or in gold.
- aurinA red colouring matter derived from phenol. Used as an indicator.
- auriphrygiateEmbroidered or decorated with gold.
- aurivorousGold-devouring.
- Côte d'OrA département (equivalent of a county) in France’s eastern region Bourgogne (Burgundy)
- deaurationThe removal of gold from an organogold compound.
- oriflammeThe red silk banner of St Denis, which the abbot of St Denis gave to French kings as they rode to war in the Middle Ages.