-ur

From Old Norse -r, the nominative singular ending for i-, u-, masculine a-, and masculine consonant stem nouns, as well as most masculine adjectives. In turn, the Old Norse endings all stem from Proto-Indo-European *-s, a general-purpose masculine/feminine singular nominative ending.

-ur

1. Occurs as the nominative singular ending in every class of strong masculine nouns, although not exclusively.
2. Occurs as the nominative singular ending for a few feminine strong nouns.
3. The majority of strong, masculine adjectives end in -ur in the nominative.

From Old Norse -ur (“weak feminine nominative and accusative plural ending”)

-ur

1. The nominative and accusative plural ending for most weak feminine nouns; triggers u-mutation of a preceding a.

• -or
• -er

-ur

1. (obsolete) Used to form plural indefinite forms for weak feminine nouns

• -our (later Anglo-Norman)

Latin -or

-ur

1. (early Anglo-Norman) -er, used for form agent nouns

Proto-Germanic *-áz

-ur m (noun)

1. Suffix variant found on masculine a-stem nouns

-ur

1. -ure; making an art or profession from an occupation, e.g. arkitekt (“architect”) → arkitektur (“architecture”)