Longman Dictionary of Contemporary English
greaseproof paper
noun
EXAMPLES FROM CORPUS
▪ Carefully remove greaseproof paper and place cake on serving plate.
▪ Cool completely then, leaving greaseproof paper in place, renew foil, wrapping tightly.
▪ Cover with a piece of pleated greaseproof paper and foil, and secure with string.
▪ Cover with the greaseproof paper, then with foil and tie with string.
▪ Packaging materials consisted mainly of greaseproof paper and brown paper bags.
▪ Strain into a bowl, cover the surface of the custard with damp greaseproof paper.
▪ There were boxes in the corner containing brand new gear still wrapped in stiff greaseproof paper and not yet assembled for use.
▪ Turn on to sheet of greaseproof paper sprinkled with icing sugar.
WordNet
greaseproof paper
n. paper that is impermeable to oil or grease; used in cooking
Wikipedia
Greaseproof paper
Greaseproof paper is paper that is impermeable to oil or grease and is normally used in cooking or food packaging. Normally greaseproof paper is produced by refining the paper stock and thus create a sheet with very low porosity. This sheet is supercalendered to further improve the density, creating a paper called glassine. The glassine is treated with starches, alginates or CMC in a size press to fill pores or treat the paper chemically to make it fat repellent. Basis weights are usually 30-50 g/m².