What does "pressboard" mean?

A kind of highly sized rag paper or board, sometimes containing a small admixture of wood pulp.

What is a synonym for "pressboard"?

Common synonyms include: cardboard, hardboard.

noun

noun ·2 syllables ·Rare ·Advanced level

Noun

1
A kind of highly sized rag paper or board, sometimes containing a small admixture of wood pulp. countable, uncountable

From press + board, because originally used in clothing presses.