English
leadproof
From lead + -proof.
Formed from lead + -proof
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
Today it means
adj Resistant to lead (the metal).
Language periods are conventional ranges, not dates for this word.
Etymograph / leadproof