Noun
a type of fiberboard
Source: WordNetMayer, 1976, p. 269. Historically wood panels were used as the substrate, and more recently un-tempered masonite and modern composite boards have been employed. Source: Internet
As an alternative to canvas, you can oil paint on MDF board, plywood, Masonite, or even hardwood. Source: Internet
Most all loggers know of this place as it is on Masonite. Source: Internet
It is a permanent and brilliant white substrate used on wood, masonite and other surfaces. Source: Internet