Longman Dictionary of Contemporary English homepage

Date: 1600-1700
Origin: ante- + Latin diluvium 'flood'

antediluvian

 adjective
     
an‧te‧di‧lu‧vi‧an formal
very old-fashioned [= outdated]:
antediluvian ideas about women
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
 
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