noun
aluminum foil; tinfoil
Commonly used for kitchen foil; the cross-reference to アルミホイル suggests this is the typical modern meaning.
See also: アルミホイル
じゃがいもを銀紙で包んでオーブンで焼いた。
I wrapped the potatoes in aluminum foil and baked them in the oven.
noun
silver-colored paper
Refers to paper with a silver sheen, not necessarily metallic foil; less common than the foil sense.
プレゼントを銀紙でラッピングした。
I wrapped the present in silver-colored paper.