What does -nus mean in Latin?

-nus, a suffix, means “suffix used to form distributive numerals”.

How do you pronounce -nus?

In classical Latin, [nʊs]; in ecclesiastical (church) Latin, [nus].

suffixfirst/second-declension suffix

-nus¹

-nus (feminine -na, neuter -num)

Classical[nʊs]Ecclesiastical[nus]

Meaning

nafemininemorphemesuffixsuffix used to form distributive numerals

Origins

Ultimately the same as the above, but apparently rebracketed at some point as *-sno- (extracted from words like *tris-no-, the original form of ternus).

Descendants

Catalan-è
Old Spanish-eno

suffixfirst/second-declension suffix

-nus²

-nus (feminine -na, neuter -num)

Classical[nʊs]Ecclesiastical[nus]

Meaning

nafemininemorphemesuffixadjective-forming suffix

Origins

Inherited from Proto-Italic *-nos.

Quick answers

What does -nus mean in Latin?: -nus, a suffix, means “suffix used to form distributive numerals”.
How do you pronounce -nus?: In classical Latin, [nʊs]; in ecclesiastical (church) Latin, [nus].