sandpaper /ˈsændˌpeɪpɚ/noun 2verb 1forms 3 noun2 •Strong paper coated with (traditionally) sand or (today) manufactured aluminum oxide, silicon carbide, or other abrasive material, used for smoothing and polishing.They like to finish it off with a piece of 600-grit sandpaper before cleaning and painting. •A sheet of such paper.I need a scraper and a sandpaper over here. verb1 •To polish or grind (a surface) with or as if with sandpaper. formssandpapered · sandpapering · sandpapers