LATIN DICTIONARYLexicon Latīnum
suffixfirst/second-declension suffix

-clus

-clus (feminine -cla, neuter -clum)
Classical[kɫʊs]Ecclesiastical[klus]

Meaning

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

Origins

Contracted form of -culus.

Quick answers

What does -clus mean in Latin?
-clus, a suffix, means “alternative form of -culus”.
How do you pronounce -clus?
In classical Latin, [kɫʊs]; in ecclesiastical (church) Latin, [klus].