V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

XMS
       eXtended Memory Specification (DOS, LIM)


V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

XMS
       eXtended Multiprocessor operating System (OS)


The Free On-line Dictionary of Computing (30 December 2018):

XMS

    Extended Memory Specification.

   (1996-01-10)