outside air temperature 
Optometry Admission Test 
Operational Air Traffic 
Operational Acceptance Test 
Operational Acceptance Testing 
Outside Air Temp 
Office for the Advancement of Teleheal… 
Office of Aerospace Technology 
Optional Application Tape 
Orbit Adjust Thrusters 
O-acetyltransferase 
o-aminoazotoluene 
Object Alternation Test 
Office Advanced Technology 
Office for Advanced Technology 
Office of Academic Technology 
Office of Institutional Research 
Ofiice of Aerospace Technology 
oligoasthenoteratozoospermia 
oligoasthenoteratozoospermic 
Oligo-Astheno-Teratozoospermie 
open artery trial 
Operational Acceptance Tests 
Optimization Algorithm Toolkit 
Optional Auxiliary Terminal 
oral anticoagulant therapy 
oral anticoagulant treatment 
oral anticoagulation therapy 
organic anion transport 
organic anion transporter