Onionskin (noun)

1. A type of thin, translucent paper that is used for making carbon copies or for writing airmail letters.
2. A type of lightweight, thin and delicate paper that's used for typewriters and printers.

Origin:

The term "onionskin" is derived from the thin, translucent paper that is similar in appearance to the skin of an onion.

Examples:

1. The onionskin paper was perfect for making carbon copies of important documents.
2. I used to use onionskin paper for writing letters to my pen pal because it was light and easy to fold.
3. I had to be very careful when typing on onionskin paper as it is delicate and tears easily.
4. The onionskin paper was perfect for making transparent overlays for presentations.
5. The onionskin paper was so thin that you could see through it and read the text on the other side.