What does -uculus mean in Latin?

-uculus, a suffix, means “alternative form of -culus”.

How do you pronounce -uculus?

In classical Latin, [ʊ.kʊ.ɫʊs]; in ecclesiastical (church) Latin, [u.ku.lus].

LATIN DICTIONARYLexicon Latīnum

suffixfirst/second-declension suffix

-uculus

-uculus (feminine -ucula, neuter -uculum)

Classical[ʊ.kʊ.ɫʊs]Ecclesiastical[u.ku.lus]

Meaning

alternativemorphemesuffixalternative form of -culus
morphemesuffixadded to a noun to form a diminutive of that noun.

Origins

Alteration, probably by rebracketing, of diminutive suffix -culus. (Some words ending in -uculus can be analyzed as containing -culus preceded by the stem vowel -u- of the fourth declension, such as genuculum from genū̆.)

Quick answers

What does -uculus mean in Latin?: -uculus, a suffix, means “alternative form of -culus”.
How do you pronounce -uculus?: In classical Latin, [ʊ.kʊ.ɫʊs]; in ecclesiastical (church) Latin, [u.ku.lus].