Pronunciation: (plug'in"), [key]
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.
1. plug (def. 3).
2. jack1 (def. 3).
3. a plug-in appliance.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.