Where does “sushizão” come from?

sushizão (Portuguese) comes from Portuguese sushi, from Japanese 寿司, from Japanese 酸し, from Japanese し, from Middle Chinese 氏.

Ancestry of “sushizão”, step by step

StepLanguageWordMeaning
1Portuguesesushisushi Japanese dish of rice with vinegar
2Japanese寿司sushi: vinegared rice served with fish or...
3Japanese酸しsour; tasting of vinegar
4JapaneseしConjunctive particle. Follows items in a list of...
5Middle Chinese氏—
Every word from Middle Chinese 氏 →Every word from Japanese し →Every word from Japanese 酸し →