Where does “keyhole” come from?

Keyhole comes from English key and English hole, with key deriving from Old English hol through Old English helan, ultimately from Proto-Indo-European -kos.

keyhole (English): The hole in a lock where the key is inserted and...

Definitions

  1. The hole in a lock where the key is inserted and...

Ancestry of “keyhole”, step by step

keyhole traces back through two separate lines of ancestry.

via English hole

StepLanguageWordMeaning
1EnglishholeA hollow place or cavity; an excavation; a pit;...
2Middle Englishholehealthy; safe; whole, complete, full
3Old Englishhola hole, a hollow; calumny; slander
4Proto-West Germanicholhollow; hole
5Proto-Germanichuląa hollow; depression; hole
6Proto-Germanichulazhollow
7Proto-Indo-Europeanḱel-to cover; to incline

via English key

StepLanguageWordMeaning
1EnglishkeyAn object designed to open and close a lock; An...
2EnglishcayA small, low island largely made of sand or coral
3SpanishCayokey island
4Taínocayosmall island

Words derived from “keyhole

Every word from Proto-Indo-European ḱel-
keyhole — Etymology, Origin & Word History | Etymology Explorer