Wiktionary
alt. (context graphical user interface English) A rectangular region of a graphical user interface where computer menus are housed. n. (context graphical user interface English) A rectangular region of a graphical user interface where computer menus are housed.
Wikipedia
A menu bar is a graphical control element which contains drop down menus. The menu bar's purpose is to supply a common housing for window- or application-specific menus which provide access to such functions as opening files, interacting with an application, or displaying help documentation or manuals. Menu bars are typically present in graphical user interfaces that display documents and representations of files in windows and windowing systems but menus can be used as well in command line interface programs like text editors or filemanagers where drop-down menu is activated with shortcut key or combination.
Usage examples of "menu bar".
The screen is still on, showing him a flat desktop display with a menu bar at the top.
More light leaked from the translucent face shield of the virching helmet, the phantom watery glow of the menu bar falling off his own brow onto the pitch-black wings of the aircraft.