There are multiple definitions:

1. flow-volume curve(English)

2. forced vital capacity(English)

   • CAT, COPD, FEF25–75, FEV1, FRC, PFT, RV, TLC, TLCO, VA, IC
   • 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