F1

Noun

Meaning

(genetics) Ellipsis of F1 hybrid.

(slang, dated) help or advice (derived from the common usage of "F1" as the help key, during the DOS era of computing programs)
(Can we add an example for this sense?)

Source: en.wiktionary.org

Close letter words and terms

F.T. F.V. F.Y.R. Macedonia F1 hybrid F2F F2L