plural of user-defined function

plural of user-defined graphic

plural of graphical user interface

(computing) command line interface

(computing) A user interface for a computer that is effectively invisible, or becomes invisible to its users with successive learned interactions.

plural of natural user interface

(formal) An email client or email reader.

plural of mail user agent

plural of character user interface

A potential bias in epidemiologic studies, involving the fact that subjects who voluntarily enroll in a clinical trial and actually follow the experimental regimen are likely to be healthier than the general population.