noun
potage; thick soup
A thick, often puréed soup, typically associated with French cuisine. In Japanese, it commonly refers to creamy or blended soups served in Western-style restaurants.
from French
今日のランチはかぼちゃのポタージュにしよう。
I'll have pumpkin potage for lunch today.
このレストランのポタージュはとてもなめらかだ。
The potage at this restaurant is very smooth.
スープ is a general term for soup, including clear broths and thin soups, while ポタージュ specifically refers to thick, creamy, or puréed soups.
Borrowed from French 'potage', meaning a thick soup.