There are multiple definitions:

1. occupational therapy/therapist(English)

   • OTR
   • Occupational disease, Therapeutic approaches

2. oxytocin(English)

3. optical topography(English)

   • fMRI
   • Imaging

4. optical tweezers(English)

   • MT
   • Bioengineering

5. olfactory training(English)

   • BTT, COT, CRS, MOT, OD, PIOD, PVOD, TDI, URTI, EBG
   • Olfactory system
   • https://doi.org….1002/alr.22624
   • https://doi.org…455613211048998

6. organ transplant(English)

   • HTX, LT
   • Transplantation
   • https://doi.org…erspect.a014985

7. open thoracotomy(English)

   • CTD, PSP, PV, SV, VATS
   • Surgery
   • https://doi.org…vts.2009.216473

8. ocular toxoplasmosis(English)

   • refers to recurrence risk after ocular surgery and the possible recommendation of prophylaxis
   • Ophthalmology, Surgery
   • https://doi.org…48.2022.2026408

9. operation time(English)

   • BESS, HS, ODI, UBE, VAS
   • Surgery
   • https://doi.org…3018-018-0725-1

10. outflow tract(English)

    • multiple intercostal recordings were supposed to get a more comprehensive view of the depolarization vector of the outflow tract ventricular arrhythmia
    • ECG, LVOT, RVOT
    • Anatomy, Cardiology, Electrophysiology
    • https://doi.org…1111/pace.12781

11. occiput transverse(Latin)

    • position that is associated with adverse maternal and neonatal outcomes
    • OA, OP
    • Obstetrics, Neonatology
    • https://doi.org…gmf.2021.100346