SD
WordNet
noun
(1) A state in north central United States
WiktionaryText
SD
- School district
- Sherrif’s department
- Shacklesons Disease, a rare brain disease.
- South Dakota, a state of the United States of America.
- Standard deviation, a mathematical measure of the spread of a list of numbers
- Sudan, a member state of the United Nations.
- standard definition, SDTV
- Secure Digital, a non-volatile memory card format developed by Matsushita, SanDisk, and Toshiba for use in portable devices.