-turio

• (possibly) -urriō

Equivalent to -tōr (agent suffix) +‎ -eō (causative suffix), from Proto-Italic *-tōr + *-eō, from Proto-Indo-European *-tōr + *-éyeti. The Latin causative suffix is the same as found in the majority, but not all, second conjugation verbs; more at -eō.

• (Classical Latin) IPA^(key): /ˈtu.ri.oː/,
• (modern Italianate Ecclesiastical) IPA^(key): /ˈtu.ri.o/,

-turiō (present infinitive -turīre, perfect active -turīvī, supine -turītum); fourth conjugation

1. I desire, I wish (verbal suffix appended to various words to make a new word meaning to desire or wish for an action.)

   ‎pariō (“I bring forth”) + ‎-turio → ‎parturiō (“I am in labour”)

   ‎nubō (“I veil, marry”) + ‎-turio → ‎nupturiō (“I wish to wed”)

   Sulla → *sullō (“I do as Sulla did”) → sullaturiō (“pessimistically jocular: I wish to imitate Sulla”)

• Appending this suffix creates a fourth conjugation verb.
• The -turio aspectual compounds are sometimes referred to as desiderative; the Late Latin era grammarians Priscianus and Diomedes use the phrase meditative, or verba meditativa, for this construction.

¹At least one use of the archaic "sigmatic future" and "sigmatic aorist" tenses is attested, which are used by Old Latin writers; most notably Plautus and Terence. The sigmatic future is generally ascribed a future or future perfect meaning, while the sigmatic aorist expresses a possible desire ("might want to").