n A device designed to diffuse a scent efficiently
n (optics) Any device that or spreads out or scatters light, making the light appear softer
n (automotive) A shaped section of a car's underbody which improves the car's aerodynamic properties
n (thermodynamics) A mechanical device that is designed to control the characteristics of a fluid at the entrance to a thermodynamic open system
n (context|sewage treatment) An aerate | aerating device consisting of a membrane with fine pores, through which air is blown to generate small bubbles
n (cooking) A cooking item that can be placed above a stove heating element or burner to separate the cooking utensil from the heat source