a row at the bottom of a window that displays information about the window, as the status of a web page load or details of an open document.
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British Dictionary definitions for status bar
a narrow horizontal area at the foot of a computer screen or window in which details are displayed about the program that is running or the document that is being edited
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012