plug-ins

plug-in

[pluhg-in]
adjective
1.
capable of or designed for being connected to an electrical power source by plugging in or inserting: a plug-in hair dryer; a plug-in transistor.
noun
2.
plug ( def 3 ).
3.
jack1 ( def 3 ).
4.
a plug-in appliance.

Origin:
1920–25; adj., noun use of verb phrase plug in

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Science Dictionary
plug-in   (plŭg'ĭn')  Pronunciation Key 
An accessory software or hardware package that is used in conjunction with an existing application or device to extend its capabilities or provide additional functions.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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