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Pronunciation varies by accent · noun
A device that is attached to an optical device in order to remove all light except for that from a particular direction..
Use slitmask when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Slitmask means A device that is attached to an optical device in order to remove all light except for that from a particular direction..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use slitmask where its definition matches the intended context.
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