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aperture mask

 - 2 dictionary results
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shadow mask

 
–noun Television.
a perforated metal plate situated behind the faceplate of a color television picture tube and having holes aligned to insure that each of three electron beams strikes only its corresponding red, green, or blue phosphor dot.
Also called aperture mask.

Origin:
1950–55
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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