MSD

MSD is an acronym for the Macromolecular Structure Database (MSD), one of the services provided by the European Bioinformatics Institute.
MSD may stand for Modem Sharing Device
MSD is also a codename for Moscow Summer Time
MSD is an acronym for Merck Sharp and Dohme (in the U.S. and Canada, aka Merck & Co.), the U.S. pharmaceutical company spun off from the german Merck KGaA
MSD is also an acronym for Mean Shortest Distance in the context of the PGP Web of trust
MSD is also an acronym for the computer diagnostic program "Microsoft Diagnostics" which was shipped with various versions of DOS and MS-Windows operating systems.
MSD is also an acronym for Master of Science in Dentistry