noun, noun which may take the genitive case particle 'no'
big size; large size
Loanword from English, used in contexts like clothing, food portions, or product dimensions. Often appears as a modifier with の.
このTシャツのビッグサイズはありますか？
Do you have this T-shirt in a big size?
ビッグサイズのポテトを注文した。
I ordered a large-size fries.