1. the tactile quality of an object that is coarse, as in sandpaper. See also touch blends.

2. a subjective quality used as part of a continuum to describe the percepts produced by amplitude-modulated sounds (see modulation). Slow, regular amplitude fluctuations that can be perceived as loudness changes are described as beats. Higher fluctuation rates, above approximately 15 Hz, are described as flutter, whereas those above approximately 40 Hz are described as being rough.