LATIN DICTIONARYLexicon Latīnum
suffixfirst/second-declension suffix

-ēnus

-ēnus (feminine -ēna, neuter -ēnum)
Classical[eː.nʊs]Ecclesiastical[e.nus]

Meaning

  1. alternativemorphemesuffixalternative form of -nus, used to form some distributive numerals.
    centum (“hundred”) + -ēnus + -enus → centēnus (“one hundred each”)
    septingentī (“seven hundred”) + -ēnus + -enus → septingentēnus (“seven hundred each”) (alternative form of septingēnus)
  2. morphemeraresuffixOf or pertaining to; -ine
    lanius (“butcher”) + -ēnus → laniēnus (“of a butcher”)
    alius (“other, another”) + -ēnus → aliēnus (“of another; alien; foreign”)
  3. morphemesuffixAdded to a place name to form an adjective.
    Antiochīa (“Antioch”) + -ēnus → Antiochēnus (“Antiochian”)

Origins

Ultimately from Proto-Indo-European *-nós: * In sense 1, from the distributive numeral suffix -nus by rebracketing of numerals such as septēnus (“seven each”), novēnus (“nine each”), dēnus (“ten each”). * In sense 2, an extended form of the relational suffix -nus; compare -ānus, -īnus. * In sense 3, borrowed from Ancient Greek -ηνός (-ēnós).

Quick answers

What does -ēnus mean in Latin?
-ēnus, a suffix, means “alternative form of -nus, used to form some distributive numerals.; Of or pertaining to; -ine”.
How do you pronounce -ēnus?
In classical Latin, [eː.nʊs]; in ecclesiastical (church) Latin, [e.nus].