Definition of "half-sheet" [half-sheet]

• In printing, an abbreviation of one half of a sheet of double size. (noun)

The Century Dictionary (Public Domain)

• "Approximately 12 by 18 inches (called a half-sheet pan) and smaller at about 12 by 9 inches (a quarter-sheet pan), these can be among the most used in your kitchen."
• "Through a small hole, I could see the squirrel's quivering tail sticking up out of my grandmother's churn... and, through the window, my husband approaching with a half-sheet of plywood in one hand and a rake in the other: Russell Crowe, Gladiator II: The Rodent Version."
• "An do half-sheet flyers to tuck into my chapbooks."