screen-saver

screen saver

noun Computers.
a program that displays a constantly shifting pattern on a screen when the computer is idle, originally used to prevent damage to the screen through continuous display of the same image but now used primarily for decoration.
Also, screen·sav·er [skreen-sey-ver] .
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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WordNet
screen saver

noun
(computer science) a moving design that appears on a computer screen when there has been no input for a specified period of time; "screen savers prevent the damage that occurs when the same areas of light and dark are displayed too long" 
WordNet® 3.0, © 2006 by Princeton University.
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00:10
Screen-saver is always a great word to know.
So is lollapalooza. Does it mean:
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
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