There are multiple definitions:

1. degree of freedom(English)

   • df
   • Statistics

2. driver of ferroptosis(English)

   • shows a complex regulatory relationship between ferroptosis and five diagnostic genes in kidney transplant patients
   • CCR5, DEG, EMT, ITGAM, PPI, PTPRC, SOF
   • Biomarker, Nephrology, Transplantation
   • https://doi.org…2X.2022.2141648

3. day on feed(English)

   • ARS, BRD
   • Preventive medicine, Veterinary medicine
   • https://doi.org…med.2014.12.001