1. a kind of hardboard made from pressed wood fibers, used as building material, insulation, etc.
2. [also m-] such hardboard
Webster’s New World College Dictionary, Fourth Edition, compiled by the
editors of Webster’s New World Dictionaries. Copyright © 2010 by Houghton
Mifflin Harcourt. Published by Houghton Mifflin Harcourt. All rights reserved.
Word origin of 'Masonite'after W. H. Mason (1877-1947?), U.S. engineer