There are multiple definitions:

1. periodic leg movement(English)

   • repetitive cramping or jerking of the legs
   • AASM, NREM, PLMD, RLS
   • Musculoskeletal system, Sleep medicine
   • https://doi.org…eep.2017.09.005

2. prolapsed leaflet mitralis(English)

   • EHRA, MAD, MVP
   • Cardiology, Pathology
   • https://doi.org…63/v.phj.113744

3. polarized light microscopy(English)

   • FTIRI, μ-EDXRF, CSMH, ESR, HPC, EULAR, HH, MCP, NSAID, OA, PMR, VAS
   • Microscopy, Medical imaging, Rheumatology
   • https://doi.org…-7757-2017-0589
   • https://doi.org…7/oarrr.s389664

4. progressive linear motility(English)

   • CASA, CTL, PUFA
   • Andrology, Veterinary medicine
   • https://doi.org…ogy.2016.12.014