Where does “bollito” come from?

bollito (Spanish) comes from Spanish -ito, from Latin -ittus, from Proto-Italic -tos, from Proto-Indo-European -tós — Creates verbal adjectives from verb stems.

Ancestry of “bollito”, step by step

Step	Language	Word	Meaning
1	Spanish	-ito	Forms diminutives of nouns; Forms names of...
2	Latin	-ittus	diminutive suffix, used to create nouns
3	Proto-Italic	-tos	Creates verbal adjectives from verb stems
4	Proto-Indo-European	-tós	Creates verbal adjectives from verb stems

Every word from Proto-Indo-European -tós →Every word from Spanish -ito →Every word from Latin -ittus →