Plural of batt; thin sheets of cotton, wool, or synthetic material used for insulation or padding.
From batt, likely derived from the verb 'bat' (to beat), since batting material was traditionally made by beating and flattening fibers together.
Batts are what fill the walls of modern houses for insulation—they're made by the same principle as ancient felt-making, where fibers get matted together, so your house walls use technology that's thousands of years old.
Complete word intelligence in one call. Free tier — 50 lookups/day.