English
frostburn
From frost + burn.
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
Proto-Indo-European *bʰrewh₁- ‘to boil’
Proto-Indo-European *bʰrenw-
Proto-Germanic *brinnaną ‘to burn’
Old Norse brinna ‘to burn’
Middle English burne
English burn
Today it means
noun Damage to a plant due to frost which results is leaves looking burnt.
Language periods are conventional ranges, not dates for this word.
Etymograph / frostburn