diffuser
/dɪˈfjuːzə(r)/(亦作diffusor)
noun
1- a thing that diffuses something, in particular传播体; 扩散体, 尤指：
1.1
- an attachment or duct for broadening an airflow and reducing its speed扩散器, 分散器; 喷雾器。
1.2
- Photography a device which spreads the light from a light source evenly and reduces harsh shadows【摄】漫射屏; 柔光屏。