There are multiple definitions:

1. flow-volume curve(English)

2. forced vital capacity(English)

   • the total amount of air you can forcefully and completely exhale from your lungs (expressed in L) after taking the deepest possible breath. It is measured using a breathing test called spirometry
   • CAT, COPD, FEF25–75, FEV1, FEV1/FVC, FRC, IC, PFT, RV, TLC, TLCO, VA
   • Respiratory system, Diagnostics
   • https://doi.org…0330-018-5659-9
   • https://doi.org…8/chest.10-0669

3. forearm vascular conductance(English)

   • Hemodynamics

4. Friend virus complex(English)

   • phenotypic adaptation to specific host major histocompatibility complex
   • MHC, EnMuLV
   • Virology
   • https://doi.org…ene.2021.716623