[ pluhg-in ]
/ ˈplʌgˌɪn /


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.


a plug-in appliance.

Origin of plug-in

First recorded in 1920–25; adj., noun use of verb phrase plug in Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for plug-in

Science definitions for plug-in


[ plŭgĭn′ ]

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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.