cardboard; thick paper
General term for paper thicker than ordinary writing paper, including cardboard, pasteboard, and heavy stock. Used in crafts, packaging, and stationery.
This box is made of cardboard.
I drew a picture on thick paper and cut it out.
I made a small box out of cardboard.
I cut the craft cardboard with a utility knife.
I pasted the photo onto a piece of cardboard and put it up on display.