Definition of antediluvian adjective from the Oxford Advanced Learner's Dictionary

 

antediluvian

 adjective
adjective
BrE BrE//ˌæntidɪˈluːviən//
 
; NAmE NAmE//ˌæntidɪˈluːviən//
 
(formal or humorous)
 
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very old-fashioned criticism of Britain’s antediluvian blasphemy law Word Origin mid 17th cent.: from ante- + Latin diluvium ‘deluge’ + -an.
See the Oxford Advanced American Dictionary entry: antediluvian