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expansion card

noun, Computers.
1.
a card in a computer on which additional chips can be mounted to expand the computer's capabilities.
Also called expansion board.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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expansion board in Science
expansion board  
A printed circuit board that can be installed to enhance a computer's capabilities, as by increasing memory or improving graphics.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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