Where does “prefocus” come from?

prefocus (English) comes from English pre, from Latin prae, from Proto-Italic prai, from Proto-Indo-European preh₂-, from Proto-Indo-European per-, from Proto-Indo-European pr̥tós — passed , crossed.

prefocus (English): Describing a lamp whose light source is...

Definitions

Describing a lamp whose light source is...

Ancestry of “prefocus”, step by step

prefocus traces back through two separate lines of ancestry.

via English pre

Step	Language	Word	Meaning
1	English	pre	Before; Precum, Cowper's fluid, pre-ejaculate; To...
2	Latin	prae	before; in front; in front of
3	Proto-Italic	prai	before; in front of
4	Proto-Indo-European	preh₂-	before, in front
5	Proto-Indo-European	per-	before, in front; first; to go through
6	Proto-Indo-European	pr̥tós	passed , crossed

via English focus

Step	Language	Word	Meaning
1	English	focus	A point at which reflected or refracted rays of...
2	Latin	focus	fireplace, hearth; firepan, coal pan, brazier;...

Every word from Proto-Indo-European pr̥tós →Every word from Proto-Indo-European per- →Every word from Proto-Indo-European preh₂- →