The phrase "plywood base" refers to a sheet made of thin layers of wood glued together, which serves as a foundation or support for something. Full definition
Acrylic mediums, muslin, cheesecloth, and painted string on linen, mounted on plywood base. (arthaps.com)
The boards are created by layering a softwood or plywood base with a wood or wood - effect top layer. (idealhome.co.uk)
Wood: Wood can work in a kitchen, especially if it's engineered hardwood flooring (sometimes called laminate hardwood flooring), which has a sturdier, more water - resistant plywood base, a hardwood veneer and usually costs more than laminate. (rismedia.com)