
A daughterboard, daughtercard, mezzanine board or piggyback board is a circuit board meant to be an extension or `daughter` of a motherboard (or `mainboard`), or occasionally of another card. In particular, daughterboards often have plugs, sockets, pins, connectors, or other attachments for other boards, which is what differentiates them from ...
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http://en.wikipedia.org/wiki/Daughterboard

see under Motherboard
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http://www.archivemag.co.uk/

A small circuit board that can be attached to a larger one (the motherboard), giving it new capabilities. For example, some companies manufacture daughterboards that add sampled sounds to soundcards that previously could only synthesize sounds via FM.
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http://www.encyclo.co.uk/local/22285
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