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light trap

noun
  1. any mechanical arrangement that allows some form of movement to take place while excluding light, such as a light-proof door or the lips of a film cassette
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012