There are multiple definitions:

1. orientation discrimination threshold(English)

   • ALG, HOA, OK, RMS
   • Ophthalmology
   • https://doi.org…ins.2021.693217

2. optimal decision threshold(English)

   • OTD
   • Decision making, Statistics
   • https://doi.org….1364/OE.472802

3. oral dissolve tab(English)

   • in children presenting to the emergency department with acute gastroenteritis
   • AGE, ED, OS
   • Gastroenterology, Pediatrics, Emergency medicine
   • https://doi.org…med.2016.06.051