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



BrE BrE//ˈbɒmbæst//
; NAmE NAmE//ˈbɑːmbæst//
[uncountable] (formal)
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words which sound important but have little meaning, used to impress people His speech was full of bombast. Word Originmid 16th cent. (denoting raw cotton or cotton wool used as padding, later used figuratively): from Old French bombace, from medieval Latin bombax, bombac-, alteration of bombyx , based on Greek bombux ‘silkworm’.
See the Oxford Advanced American Dictionary entry: bombast