1\də-ˈnir, də-ˈnyā\: a small originally silver coin formerly used in western Europe
2\ˈde-nyər\: a unit of fineness for yarn equal to the fineness of a yarn weighing one gram for each 9000 meters
100-denier yarn is finer than 150-denier yarn
Middle English denere, from Anglo-French dener, denier, from Latin denarius, coin worth ten asses, from denarius containing ten, from deni ten each, from decem ten — more at ten