Wordia - The Definition Of Sound
sound
noun, a) a periodic disturbance in the pressure or density of a fluid or in the elastic strain of a solid, produced by a vibrating object. It has a velocity in air at sea level at 0°C of 331 metres per second (741 miles per hour) and travels as longitudinal waves b) (as modifier)
From Collins
©HarperCollins 2008. Collins English Dictionary definition of sound