From Longman Dictionary of Contemporary Englishgraphical user interfaceˌgraphical ˈuser ˌinterface noun [countable] (abbreviation GUI) a way of showing and organizing information on a computer screen that is easy to use and understand
Examples from the Corpus
graphical user interface• Enhancements to System Administration Manager include a Motif-based graphical user interface and a task-oriented design to help users step through system-administration functions.• An add-on graphical user interface is available.• It uses a drag and drop style graphical user interface based on OSF/Motif.From Longman Business Dictionarygraphical user interfaceˌgraphical ˌuser ˈinterface (also graphical interface, GUI)COMPUTING a computer interface that is easy to use and understand → interface 