2. Initialism. (aviation) Part Task Trainer (See w:Flight simulator#Flight simulators and flight training devices at Wikipedia) ¹
3. Initialism. (hematology) Partial thromboplastin time ¹
4. Initialism. (context: oil drilling) Partitioning tracer test ¹
5. Initialism. w:Platform Terminal Transmitter ¹
6. Initialism. (telecommunications) Postal Telephone and Telegraph ¹
7. Initialism. w:Professional Technical Trainer ¹
8. Initialism. w:Protein truncation test ¹
9. Initialism. (chemistry) Polytrimethylene terephthalate ¹
¹ Source: wiktionary.com
Lexicographical Neighbors of PTT
PSUs PSW PSX PSl. PT PTA PTB PTC PTCA PTFE | PTH PTO PTOL PTSD PTT (current term) PTW PTWC PT boat PU PUBS | PUC PUE PUR PUS PV PVA PVAL PVAc PVC |