Construction material supplied in sheets, and made of three or more layers of wood veneer glued together, laid up with alternating layers having their grain perpendicular to each other.
"The carpenter measured the plywood before cutting it into planks for the new deck railing."
To fit or block up with plywood.
"The carpenter decided to ply the broken window frame with fresh lumber to keep the rain out before installing new glass."
The word plywood comes from combining "ply," meaning sheet, with "wood." It originally referred to sheets of wood layered together.