There are multiple definitions:

1. quantum dot(English)

   • a semiconductor nanocrystal
   • MIP-QD, QDIP
   • Nano-sciences
   • https://doi.org…050-6120/aaf0b2

2. quaque die(Latin)

   • once a day (E)
   • bid, EOT
   • Pharmacology / pharmaceutics, Guidelines
   • https://doi.org…28/AAC.40.1.173
   • https://doi.org…ardio.2024.3810

3. qi-blood deficiency [syndrome](English)

   • refers to microstructural white matter changes
   • Alternative medicine, Brain (dys)function, Medical imaging
   • https://doi.org…000000000001800