greaseproof

Imagine wrapping freshly baked cookies: you want the paper to hold them, not become soaked with butter. That's where "greaseproof" comes in. It describes paper or another material that stops fats and oils from soaking through. You will often see this word used for food packaging, bakery liners, or wrappers for oily foods. A greaseproof material helps keep the food contained and your hands cleaner.

"Greaseproof" describes a quality of a material that stops fats, oils, or other greasy substances from soaking through or being absorbed easily. It is an important feature for things made to hold oily foods or protect surfaces from stains. The word is often close in meaning to "oil-resistant," but it is usually used when talking about paper, packaging, or coatings made to deal with grease.

This term is most commonly used for paper and packaging. Think about the paper lining a pizza box: it is there so the oil from the pizza does not soak through to the box or the table. In the same way, bakery bags and sandwich wrappers may be greaseproof to help hold pastries, fried foods, or buttered items without making a mess.

However, "greaseproof" is not limited to paper. Some plastics, treated fabrics, and special coatings can also be described this way if they block grease well. The word is especially common in food service and packaging, where keeping oil from leaking through is important.

So, when you see something labeled "greaseproof," think of a barrier that helps oily or buttery food stay where it should. It is there to keep the contents in place and the outside surface cleaner.