LATIN DICTIONARYLexicon Latīnum
suffixfirst/second-declension suffix

-legus

-legus (feminine -lega, neuter -legum)
Classical[ɫɛ.ɡʊs]Ecclesiastical[le.ɡus]

Meaning

  1. morphemesuffixforms adjectives related to the concept of collecting, gathering together
    flōs (“flower”) + -legus → flōrilegus (“flower-gathering”)
  2. morphemenoun from verbsuffixone who gathers, -gatherer, -collector
    dēns (“a tooth”) + -legus → (humorous) dentilegus (“a tooth-gatherer”)

Origins

From legō (“to gather, collect”) + -us (adjective-forming suffix).

Quick answers

What does -legus mean in Latin?
-legus, a suffix, means “forms adjectives related to the concept of collecting, gathering together; one who gathers, -gatherer, -collector”.
How do you pronounce -legus?
In classical Latin, [ɫɛ.ɡʊs]; in ecclesiastical (church) Latin, [le.ɡus].