Department Time Administrator 
Deputy Technical Advisor 
descending thoracic aorta 
designated travel agency 
Desktop Assistant 
Detailed Traffic Analysis 
DETROIT EDISON CO. 
Detroit Tooling Association 
Development Text Article 
Differential Thermal Analyser 
Differential Thermal Analyzers 
diffusion tensor analysis 
Digital Terminals & Access 
Digital Test Access 
Digital Tone Adapter 
Digital Transistor Arrays 
Digitally Terminated Analog 
diphtheria toxin 
diphtheria toxin A 
diphtheria toxin A chain 
diphtheria toxin fragment A 
Direct Tape Access 
Directing Training Assistance 
Directorate of Threat Analysis 
disabled toilet alarm 
discriminated taste aversion 
Dispersion-Toughened Alumina 
distance-to-agreement 
Distributable Technical Audit 
Distributed Tranformer Amplifier