: a type of plastic that is used to make various products and especially to make a clear liquid that is spread on a surface (such as a wooden floor) and that becomes hard when it dries
The floor will need two coats of polyurethane.
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“Polyurethane.” Merriam-Webster.com Simple Definition, Merriam-Webster, https://www.merriam-webster.com/simple/polyurethane. Accessed 20 Jun. 2026.
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