diffuser
noun
dif·fus·er di-ˈfyü-zər 
plural diffusers
1
: one that diffuses: such as
a
: a device (such as a reflector) for distributing the light of a lamp evenly
b
: a screen (as of cloth or frosted glass) for softening lighting (as in photography)
c
: a device (such as slats at different angles) for deflecting air from an outlet in various directions
d
: a device that produces a fine mist of water and often essential oils
2
: a device for reducing the velocity and increasing the static pressure of a fluid passing through a system
Example Sentences
Recent Examples on the Web The car’s unique shape—along with its front splitter, vehicle-length ground-effect tunnels and massive rear diffuser—can produce more than 2,635 pounds of downforce. 
Bryan Hood, Robb Report, 22 Aug. 2022 The Solus is glued to the asphalt thanks to ground-effect tunnels running the length of the car, fed by vents behind the large front splitter and spitting air out the back of the car via a cavernous rear diffuser. Caleb Miller, Car and Driver, 19 Aug. 2022 After four years of high school, your grad has more than earned some serious R&R—and that’s why this essential oil diffuser is such a great gift. Lauren Gray, Popular Mechanics, 16 June 2022 Use a diffuser to even out your curl pattern and add more body. Jessica Teich, Good Housekeeping, 5 Aug. 2022 To create your own loaded topknot, start with dry hair that has some texture to it–use texturizing spray, or blow-dry your hair using a diffuser. Danielle Sinay, Glamour, 4 Aug. 2022 To test this, Brooks’ team placed a diffuser with peppermint essential oil within an empty room. Wired, 2 Aug. 2022 Then, lock in the shape by wrapping a triangular hair-setting net around the head, blow-drying with a diffuser and spritzing a high-shine hair spray. Amber Kallor, WSJ, 26 July 2022 The side sills are another unique touch, and in the back is a black diffuser with the Type R's trademark triple-tip, center-exit exhaust. Eric Stafford, Car and Driver, 21 July 2022 See More
Bryan Hood, Robb Report, 22 Aug. 2022 The Solus is glued to the asphalt thanks to ground-effect tunnels running the length of the car, fed by vents behind the large front splitter and spitting air out the back of the car via a cavernous rear diffuser. Caleb Miller, Car and Driver, 19 Aug. 2022 After four years of high school, your grad has more than earned some serious R&R—and that’s why this essential oil diffuser is such a great gift. Lauren Gray, Popular Mechanics, 16 June 2022 Use a diffuser to even out your curl pattern and add more body. Jessica Teich, Good Housekeeping, 5 Aug. 2022 To create your own loaded topknot, start with dry hair that has some texture to it–use texturizing spray, or blow-dry your hair using a diffuser. Danielle Sinay, Glamour, 4 Aug. 2022 To test this, Brooks’ team placed a diffuser with peppermint essential oil within an empty room. Wired, 2 Aug. 2022 Then, lock in the shape by wrapping a triangular hair-setting net around the head, blow-drying with a diffuser and spritzing a high-shine hair spray. Amber Kallor, WSJ, 26 July 2022 The side sills are another unique touch, and in the back is a black diffuser with the Type R's trademark triple-tip, center-exit exhaust. Eric Stafford, Car and Driver, 21 July 2022 See More Word History
Etymology
diffuse entry 2 + -er entry 2
First Known Use
1645, in the meaning defined at sense 1