Where does “plazenteiro” come from?

plazenteiro (Old Portuguese) comes from Old Portuguese -eiro, from Latin -arium, from Latin -arius, from Proto-Indo-European -yós — Creates adjectives from noun or verb stems.

Ancestry of “plazenteiro”, step by step

Step	Language	Word	Meaning
1	Old Portuguese	-eiro	-eer
2	Latin	-arium	Used to form nouns denoting a "place where things...
3	Latin	-arius	Used to form adjectives from nouns or numerals;...
4	Proto-Indo-European	-yós	Creates adjectives from noun or verb stems

Every word from Proto-Indo-European -yós →Every word from Latin -arius →Every word from Latin -arium →