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expansion card

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noun Computers.
  1. a card in a computer on which additional chips can be mounted to expand the computer's capabilities.
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Also called expansion board.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

expansion board in Science

expansion board

  1. A printed circuit board that can be installed to enhance a computer's capabilities, as by increasing memory or improving graphics.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.