Cardboard (noun)

1. A stiff, flat material made from compressed paper pulp, used for making boxes, signs, and other products.
2. A material that is stiff and thick like cardboard, but made from other materials such as plastic or metal.

Origin:

The word "cardboard" comes from the early 19th century, it is a combination of the word "card" which refers to a stiff piece of material used for cleaning and the suffix "-board" which refers to a piece of material cut to a certain size and shape. the word card was used as an old past participle of the word "card" meaning to clean or comb flax or hemp to make it ready for spinning.

Examples:

1. The box was made of cardboard.
2. We used cardboard to make a makeshift stage.
3. The cardboard was too flimsy to hold the weight.
4. The toy was packaged in a cardboard box.
5. He made a cardboard cutout of a famous movie star.