A type of translucent paper treated with sulfuric acid, used for tracing, packaging, and crafts. Technical term; in everyday contexts, トレーシングペーパー or パーチメント紙 may be more common.
Parchment paper is used for drafting and packaging.
Compound of 硫酸 (sulfuric acid) and 紙 (paper), referring to the sulfuric acid treatment used in its production.