lighttight

[lahyt-tahyt]
adjective Chiefly British.

Origin:
1880–85; light1 + tight, on the model of watertight, airtight, etc.

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Example sentences
The fan pulls air over the lamp and out the exhaust, which is made lighttight by a series of interlocking baffles.
Again, the counting must be performed in a lighttight container.
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