F.D.

abbreviation for

1. Fidei Defensor.
2. fire department.
3. focal distance.

FD

abbreviation for

1. Fidei Defensor

Word History and Origins

Origin of F.D.¹

Latin: Defender of the Faith

Example Sentences

I took the notes, and from my notes I dictated this, which we call an FD-302.

From Project Gutenberg