Where does “-eira” come from?

-eira (Old Portuguese) comes from Latin -āria, from Latin -ārius, from Proto-Italic *-āzios — Forms relational adjectives to nouns (and rarely numerals).

Ancestry of “-eira”, step by step

StepLanguageWordMeaning
1Latin-āriaused to form feminine counterparts of masculine agent nouns in
2Latin-āriuser
3Proto-Italic*-āziosForms relational adjectives to nouns (and rarely numerals)

Words derived from “-eira”

Every word from Proto-Italic *-āzios →Every word from Latin -ārius →Every word from Latin -āria →