
The expansion card (also expansion board, adapter card or accessory card) in computing is a printed circuit board that can be inserted into an electrical connector, or expansion slot on a computer motherboard, backplane or riser card to add functionality to a computer system via the expansion bus. An expansion bus is a computer bus which moves inf...
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http://en.wikipedia.org/wiki/Expansion_card

formerly called podules or peripheral modules - an extra circuit board fitted to your computer that will allow it to perform various extra functions which cannot be done with software alone
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http://www.archivemag.co.uk/

A circuit board that plugs into a motherboard, used to add new peripherals to a computer system. Also called an adapter card.
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http://www.encyclo.co.uk/local/20581

An electronic circuit which is attached to the motherboard to add extra capabilities such as quality graphics or sound.
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http://www.encyclo.co.uk/visitor-contributions.php

a card in a computer on which additional chips can be mounted to expand the computer's capabilities.
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https://www.infoplease.com/dictionary/expansion-card
No exact match found.