There are multiple definitions:

1. self-expanding valve(English)

   • a supraannular bioprosthesis
   • TAVR, BEV, TAVI
   • Cardiology, Prosthetics
   • https://doi.org…6/NEJMoa1816885

2. saccadic eye velocity(English)

   • GABAA, PMDD
   • Ophthalmology, Menstruation
   • https://doi.org…0213-016-4258-1