opaque

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opaque

1. not transmitting radiant energy, such as electromagnetic or corpuscular radiation, or sound
2. Photog an opaque pigment used to block out particular areas on a negative
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

opaque

Impervious to the transmission of visible light.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.