millboard
/ˈmɪlˌbɔrd/
noun
- A strong, stiff cardboard or pasteboard used for book covers, boxes, or other sturdy items.
- The old book had covers made of thick millboard that had lasted for decades.
- The packaging company ordered a large shipment of millboard for making boxes.
- She used millboard to create a sturdy backing for her art project.
Synonyms