addin

add-in

[ad-in]
noun
1.
a component, as a video card or chip, added to a computer to expand its capabilities.
2.
a small software program that adds a feature to another application.

Origin:
1985–90

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
add-in

noun
a printed circuit that can be inserted into expansion slots in a computer to increase the computer's capabilities [syn: circuit board
WordNet® 3.0, © 2006 by Princeton University.
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