Where does “inhibit” come from?

Inhibit comes from Latin inhibitus, past participle of inhibeo, composed of the prefix in- and a root from Proto-Indo-European h₁én meaning "not."

inhibit (English): To hold in or hold back; to keep in check;...

Definitions

Step	Language	Word	Meaning
1	Latin	inhibitus	restrained, inhibited
2	Latin	inhibeō	to lay hold of, keep back, restrain, curb, check, stop
3	Latin	īn-	un-, non-, not
4	Latin	în	in, at, on, upon, from (space)
5	Latin	en	lookǃ beholdǃ; reallyǃ?; come onǃ
6	Proto-Italic	en	in
7	Proto-Indo-European	h₁én	in