Ground Data System 
Global Directory Service 
Great Dark Spot 
Gas Delivery System 
General Data Stream 
GNC Dynamic Simulator 
General Depreciation System 
geriatric depression scale 
Global Dialup Service 
Gas Distribution System 
general declassification schedule 
Generalized Data Stream 
Generation Data Set 
Generation Data Sets 
GeoMet Data Services 
Global Distribution System 
Glow Discharge Spectrometer 
Graphic Design Standard 
Graphic Display System 
Ground Data Systems 
Gao, Dregia and Shewmon 
Gas Discharge System 
Gastrointestinal Diffusion System 
GDP dissociation stimulator 
GDP dissociation stimulators 
General Dental Service 
General Dental Services 
General dentists 
General Design Specification 
genetic distances