English
leadlight
From lead + light.
Proto-Indo-European *leyt- ‘to leave, die’
…
Proto-Germanic *laidijaną ‘to cause one to go, lead’
Proto-West Germanic *laidijan
Old English lǣdan ‘to lead’
Middle English leden
English lead
Proto-Indo-European *lewk- ‘to shine’
…
Proto-Germanic *leuhtą
Proto-West Germanic *leuht ‘light’
Old English lēoht
Middle English light ‘light, illumination’
English light
Today it means
noun A decorative window made of small sections of glass supported in lead divider bars, or cames.
Language periods are conventional ranges, not dates for this word.
Etymograph / leadlight