formalin

As a noun formalin

is a solution of formaldehyde in water; used as a disinfectant and to preserve biological specimens.

As an adverb casually is

in a casual manner.

As an abbreviation pfa

is please find attached.

As a noun formalin is

a solution of formaldehyde in water; used as a disinfectant and to preserve biological specimens.

As nouns the difference between paraformaldehyde and formalin

is that paraformaldehyde is paraformaldehyde while formalin is a solution of formaldehyde in water; used as a disinfectant and to preserve biological specimens.

Fomaldehyde is likely misspelled.

Fomaldehyde has no English definition.

As a noun formalin is

a solution of formaldehyde in water; used as a disinfectant and to preserve biological specimens.

As nouns the difference between formalin and normalin

is that formalin is a solution of formaldehyde in water; used as a disinfectant and to preserve biological specimens while normalin is (mineralogy) obsolete name for a supposed mineral, now believed to be phillipsite.