mætˈbɔːrd

Definitions

1. noun

a thick, smooth board, typically of cardboard or fiberboard, used to mount and protect art, photographs, and other items for display

“The artist used a high-quality mattboard to frame her latest oil painting.”

2. noun

a backing board for a picture frame, typically made of cardboard or fiberboard

“The old frame was replaced with a new one that included a sturdy mattboard.”