There are multiple definitions:

1. optic nerve(English)

   • nervus opticus (L)
   • Ophthalmology, Neuropathy

2. optic neuritis(English)

   • a common clinical manifestation of central nervous system inflammation. Depending on the etiology, visual prognosis and the risk for recurrent injury may vary. Rapid and accurate diagnosis may be critical for limiting vision loss, future neurologic disability, and organ damage
   • ACE, ANA, CSF, MOG, MS, NMOSD, OCT, CON, NLP, QOL
   • Ophthalmology, Neuropathy, Diagnostics
   • https://doi.org…000000000000768
   • https://doi.org…000000000001340

3. obturator nerve(English)

   • ONB, TURBT
   • Nervous activity - (para)sympathetic, Urology
   • https://doi.org…55/2017/7023750

4. overnutrition(English)

   • MNHD, NN
   • Nutrition, Metabolism, Pregnancy
   • https://doi.org…1440-1681.12147