PFD

Definition

Initialism of phase-frequency detector.

Example Sentences

• "Return your PFD to a hanger on the PFD storage rack."
• "Above 32 degrees latitude in the Atlantic Ocean, commercial fishing vessels must carry immersion suits. Below that latitude, they must carry lifejackets, also known as personal flotation devices (PFDs). In other waters, the dividing line is 35 degrees. The PFDs have to be on the boat. Fishers do not have to wear them."