Where does “kneecap” come from?

Kneecap comes from English knee and English cap, which derives from Latin capitālis, meaning of the head, ultimately from Proto-Indo-European kauput-.

kneecap (English): The flat, roundish bone in the knee; A metal...

Definitions

  1. The flat, roundish bone in the knee; A metal...

Ancestry of “kneecap”, step by step

kneecap traces back through two separate lines of ancestry.

via English knee

StepLanguageWordMeaning
1EnglishkneeIn humans, the joint or the region of the joint...
2Middle EnglishknēThe knee or a similar joint in other animals
3Old Englishcnēogeneration
4Proto-West Germanickneuknee
5Proto-Germanicknewąknee
6Proto-Indo-Europeanǵnéwo-knee
7Proto-Indo-Europeanǵónuknee

via English Cap

StepLanguageWordMeaning
1EnglishCapA nickname for the captain of a team, ship, etc
2EnglishCapricornSomeone with a Capricorn star sign
3FrenchCapricorneCapricorn
4LatinCapricornusCapricornus, the constellation of the zodiac
5Latincapera male goat, billy goat; vocative singular of...
6Proto-Italic*kaproshe-goat
7Proto-Indo-Europeankáproshe-goat, billy goat

Words derived from “kneecap

Every word from Proto-Indo-European ǵónuEvery word from Proto-Indo-European ǵnéwo-Every word from Proto-Germanic knewą