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in the PONS Dictionary

dif·fus·er [dɪˈfju:zəʳ, Am -ɚ] N

1. diffuser (for light):

diffuser
[Licht]diffusor m
diffuser
lichtstreuender Körper

2. diffuser (for airstream):

diffuser
Diffusor m <-, -so̱·ren>
diffuser
Luftverteiler f
diffuser
[Druckluft]belüfter m

diffuser [dɪˈfjuːzə] N

diffuser
Belüfter

submerged diffuser

submerged diffuser
Unterwasser-Belüfter