A sheet of compressed cotton, wool, or synthetic fibers used for padding, insulation, or quilting.
Possibly from 'bat' (to beat/flatten) or related to batting (the material). Used in textile and construction contexts since at least the 18th century.
Batt is the fluffy stuff inside your winter jacket and insulation in your attic—it's made by compressing fibers so tightly they create air pockets that trap heat!
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