Thin sheet of aluminum used for cooking, wrapping, or insulation.
I wrapped the potatoes in aluminum foil and baked them in the oven.
Standard kanji-katakana compound for aluminum foil.
Kana spelling is common in everyday writing, especially when the kanji 箔 is not at hand.
Compound of アルミ (from English 'aluminum') and 箔 (foil, leaf).