The spelling of the word "Portoise" may be confusing, but it follows the rules of French phonetics. In IPA notation, it is transcribed as /pɔʁtwɑz/. The "oi" combination is pronounced as /wa/ in French, and the final "-e" is silent. Therefore, the word is pronounced as "pɔʁtwɑ", with the stress on the second syllable. "Portoise" is a feminine noun that means "port city" in French and is commonly used in the context of naval history and geography.