sort by Rank | Alpha
| Possible Meanings | Rank |
| McHenry IPSC Shooting Society | *** |
| Midwest Independent Soil Samplers | *** |
| Management Information Systems Society | *** |
| McLeod Institute of Simulation Sciences | *** |
| midsagittal intracranial skull surface | ** |
| Minor Injury Severity Scale | ** |
| Modified Injury Severity Scale | ** |
| Modified Injury Severity Score | ** |
| Multifocal independent spike syndrome | ** |
| multiple intermediate sequence search | ** |
| myocardial infarction severity score | ** |
| Minimum Information Security Standards | ** |
| Minimally Invasive Surg Symposium | ** |
| Mannheim Interview on Social Support | ** |
| mercury-in-silastic strain gauges | ** |
| Metabolic and Infusion Support Service | ** |
| Mexican Institute of Social Security | ** |
| Modification of Injury Severity Scale | ** |
| Modified Abbreviated Injury Severity Scale | ** |
| Mathematics Intensive Summer Session | ** |
| Muslim Iranian Student S | ** |
| modification of the Injury Severity Scale | ** |
| Mary Immaculate Star of the Sea | ** |
| Make It Sound Special | ** |
| Maywood Interim Storage Site | ** |
| Michigan International Soaring Society | ** |
| Multisite Intervention Study on Suicidal | ** |
| Minimally Invasive Sinus Surgery | ** |
| Master of Information Systems Security | ** |
| Medical Information Systems Symposium | ** |
| Medical Interview Satisfaction Scale | * |
| Minimal Invasive Spinal Surgery | * |
| Marine Integrated Survey Systems | * |
| Modular Intelligent Sensor System | * |
| Management and Information System Staff | * |
| Marine Industrial Safety Section | * |
| Metal Insulator Semiconductor Switch | * |
| Monitor Integrated Safety System | * |
| Mice on International Space Station | * |
| Midline Internal Skull Surface | * |
| Med Information Server Statistics | * |