Definition of inferno noun from the Oxford Advanced Learner's Dictionary

 

inferno

 noun
noun
BrE BrE//ɪnˈfɜːnəʊ//
 
; NAmE NAmE//ɪnˈfɜːrnoʊ//
 
[usually singular](pl. infernos)
 
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a very large dangerous fire that is out of control a blazing/raging inferno The flames quickly turned the house into a raging inferno. Three men managed to escape from the inferno. Word Origin mid 19th cent.: from Italian, from Christian Latin infernus ‘below, underground’, used by Christians to mean ‘hell’, on the pattern of inferni (masculine plural) ‘the shades’ and inferna (neuter plural) ‘the lower regions’.
See the Oxford Advanced American Dictionary entry: inferno