Where does “cuspinho” come from?

cuspinho (Portuguese) comes from Portuguese -inho, from Old Portuguese -ỹo, from Latin -inus, from Proto-Italic -īnos, from Proto-Indo-European -iHnos, from Proto-Indo-European -no- — adjectival suffix.

Ancestry of “cuspinho”, step by step

StepLanguageWordMeaning
1Portuguese-inhoreplaces -o and -a to form diminutives
2Old Portuguese-ỹo—
3Latin-inusOf or pertaining to; -ine
4Proto-Italic-īnosof/belonging to
5Proto-Indo-European-iHnosCreates adjectives of materials
6Proto-Indo-European-no-adjectival suffix
Every word from Proto-Indo-European -no- →Every word from Latin -inus →Every word from Portuguese -inho →