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A feature of a webpage or GUI that causes a pop-up box to appear or other change to occur when the pointer is held over a particular object or area of the screen.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Computer Science) computing (on the page of a website) an item, esp a graphic, that changes or pops up when the pointer of a mouse moves over it
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014