English
frostproof
From frost + -proof.
Formed from frost + -proof
Proto-Indo-European *prews- ‘to freeze’
…
Proto-Germanic *frustaz
Proto-West Germanic *frost
Old English frost
Middle English frost ‘Cold or freezing weather’
English frost
Today it means
adj Resistant to frost.
Language periods are conventional ranges, not dates for this word.
Etymograph / frostproof