What is the meaning of -ur?

Forms adjectives from verbs. The most common meaning the suffix carries is comparable to -ed in English.

-ide

nominative singular ending of most strong masculine nouns

nominative singular ending of a few strong feminine nouns

nominative singular masculine strong ending of most adjectives

genitive singular ending of a few strong feminine; triggers i-mutation of some preceding vowels

nominative/accusative masculine plural ending of a few strong masculine and feminine nouns; triggers i-mutation of some preceding vowels

nominative/accusative masculine plural ending of a few weak masculine stem nouns; triggers i-mutation of some preceding vowels

indefinite nominative/accusative plural of -a f (most weak feminine nouns)

second/third-person singular present indicative of -a / -ja (strong verbs and some weak verbs)

-ure.

alternative form of -our

alternative form of -ure

Used to form plural indefinite forms for weak feminine nouns

alternative form of -or (suffix indicating an agent noun)

Suffix variant found on masculine a-stem nouns

Forms masculine nouns

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

Source: wiktionary.org