Where does “introdutório” come from?

introdutório (Portuguese) comes from Late Latin introductorius, from Latin introductus, from Latin intrōdūcō, from Latin intrō, from Latin intra, from Latin interus, from Proto-Indo-European h₁énteros, from Proto-Indo-European -teros — Contrastive or oppositional adjectival suffix.

introdutório (Portuguese): introductory

Definitions

introductory

Ancestry of “introdutório”, step by step

Step	Language	Word	Meaning
1	Late Latin	introductorius	introductory
2	Latin	introductus	introduced
3	Latin	intrōdūcō	—
4	Latin	intrō	—
5	Latin	intra	within; inside; during; less than
6	Latin	interus	—
7	Proto-Indo-European	h₁énteros	inside, within
8	Proto-Indo-European	-teros	Contrastive or oppositional adjectival suffix

Every word from Proto-Indo-European -teros →