# PFD

> English word · Noun · frequency rank #79,852

## Definitions
1. Initialism of phase-frequency detector.
2. Initialism of personal flotation device.
3. Initialism of primary flight display.
4. Initialism of process flow diagram.
5. Initialism of photon flux density.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/pfd