The definition of a tagboard is a type of sturdy cardboard.
An example of a tagboard is cardboard used for a poster or to post notes on.
sturdy cardboard used for tags, posters, mountings, etc.
A smooth-surfaced heavy paper or light cardboard used especially for making stencils, cutouts, and posters. Also called oak tag .
Origin of tagboardtag 1 ( perhaps because such paper or cardboard was used to make tags ) board