Where does “callaro” come from?

callaro (Italian) comes from Latin caldārium, from Latin -ārium, from Latin -um, from Proto-Italic *-om, from Proto-Indo-European *-oHom.

Ancestry of “callaro”, step by step

StepLanguageWordMeaning
1Latincaldāriumwarm bath
2Latin-āriumused primarily to form nouns of purpose from other nouns, such as places where things are kept or objects used for a particular end
3Latin-umnominative neuter singular of -us; accusative...
4Proto-Italic*-om—
5Proto-Indo-European*-oHom—
Every word from Proto-Indo-European *-oHom →Every word from Latin -ārium →Every word from Latin -um →