Wood pulp made by grinding wood against a stone, used in making cheaper paper and newsprint.
From ground (past participle of grind) + wood. Industrial term from the 19th century when mechanical papermaking developed.
Groundwood pulp is so cheap to make it revolutionized publishing—suddenly newspapers could be mass-produced, but groundwood paper yellows and disintegrates within decades, which is why old newspapers crumble in libraries.
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