There are 2 definitions of fb in English:

fb1

Syllabification: fb
(also f.b.)

abbreviation

Sports Fullback.

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Word of the day animalcule
Pronunciation: ˌanɪˈmalkjuːl
noun
a microscopic animal

There are 2 definitions of fb in English:

FB2

Syllabification: FB

abbreviation

1Foreign body.
1.1Freight bill.

Definition of fb in:

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Word of the day animalcule
Pronunciation: ˌanɪˈmalkjuːl
noun
a microscopic animal