plug-in
noun [ C ]
(also plugin) uk/ˈplʌɡɪn/ us IT
a small computer program that makes a larger one work faster or have more features:
The company charges $50 extra for the optional plug-in.
Users simply download a small plugin that works with their browsers.
plug-in
adjective
(also plugin) ukus IT
relating to things that can be added to a computer system to make it work faster or have more features:
a plug-in card/keyboard/modem If your PC has no USB ports, you can add them with a plug-in card.
able to be connected using a plug (= object with metal pins for connecting equipment to an electricity supply):
a plug-in electric car/hybrid
Alternatively, plug-in timer switches can be bought from hardware stores.