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lighttight

[lahyt-tahyt] /ˈlaɪtˌtaɪt/
adjective, Chiefly British
Origin
1880-1885
1880-85; light1 + tight, on the model of watertight, airtight, etc.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for lighttight
  • 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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