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Neutralfilter n
astr.	neutral medium
chim.analyt.	neutral-density filter; grey filter
constr.	neutral light filter
optiq.	density grey filter; neutral density filter (commonly used as an attenuator)
phys.	neutral absorber; neutral density filter; neutral filter; neutral gray nonselective filter; nonselective absorber; nonselective filter
techn.	optic light filter