MFD may refer to: Fire departments. Madison Fire Department, US. Minneapolis Fire Department, US. Milwaukee Fire Department, US. Mumbai Fire Brigade, India. Science, technology, and medicine. Macroscopic Fundamental Diagram, a type of fundamental diagram of traffic flow in transportation engineering. Microfarad, a unit of electrical capacitance sometimes written as "MFD" Minimum focus distance, in macro photography. Mode field diameter, an expression of distribution of the irradiance, across the end face of a single-mode fiber.
https://en.wikipedia.org/wiki/MFD