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A program, such as a spell checker or calendar, that remains loaded in memory so that it may be quickly recalled while another program is running, as found in operating systems which do not allow multitasking.
[t(erminate and) s(tay) r(esident).]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
n., pl. TSRs, TSR's.
a computer program with any of several ancillary functions, usu. held resident in RAM for instant activation while one is using another program.
[t(erminate and) s(tay) r(esident)]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.