burnt

the word 'burnt' originates from the middle english 'brent' or 'brunt', the past participle of 'brennen' or 'birnen', meaning 'to burn'. these middle english forms derive from the old english 'bærnan' (to kindle, burn) and 'beornan' (to be on fire), which are causative and intransitive forms of the same germanic root. this root, reconstructed as proto-germanic brinnaną (to burn) and brannijaną (to cause to burn), can be traced further back to the proto-indo-European root bʰrenw-, meaning 'to bubble, burn, or smoke'. the modern spelling 'burnt' became standard in british english, while 'burned' is more common in american english, both serving as the simple past and past participle of the verb 'burn' and as an adjective describing the state resulting from fire.

the word 'burnt' is a past tense and past participle form of the verb 'burn'. it is not productively formed from separate, meaningful morphemes in modern english. the base 'burn' is a simplex word of germanic origin.