There are multiple definitions:

1. arteriovenous fistula(English)

   • an irregular connection between an artery and a vein
   • aVF
   • Vascular disease
   • https://www.ncb…ooks/NBK493195/

2. adjacent vertebral fracture(English)

   • OVF, PPS, VBR, VP
   • Spine (or spinal cord), Injury
   • https://doi.org…000000000003988

3. abnormal vaginal flora(English)

   • in the first trimester of pregnancy may be a risk factor for shortening cervix length at second and third trimester
   • Gynecology, Pregnancy
   • https://doi.org/10.1002/uog.7568