LATIN DICTIONARYLexicon Latīnum
suffixfirst conjugation

-illō

-illō (present infinitive -illāre, perfect active -illāvī, supine -illātum)
Classical[ˈɪl.loː]Ecclesiastical[ˈil.lo]

Meaning

  1. morphemeForms diminutive verbs from verbs.
    focilō (“to refresh, resuscitate”), less commonly focillō, from the noun focus.
    cantillō (“to hum, warble”), from the verb cantō

Quick answers

What does -illō mean in Latin?
-illō, a suffix, means “Forms diminutive verbs from verbs.”.
How do you pronounce -illō?
In classical Latin, [ˈɪl.loː]; in ecclesiastical (church) Latin, [ˈil.lo].