Antediluvian Definition

ăntĭ-də-lo͝ovē-ən
adjective
Occurring or belonging to the era before the Flood.
American Heritage
Of the time before the biblical Flood.
Webster's New World
Extremely old or old-fashioned.
American Heritage
Very old, old-fashioned, or primitive.
Webster's New World
Wiktionary
Antonyms:
noun
An antediluvian person or thing.
Webster's New World
One who lived prior to Noah's Flood.
Wiktionary
Synonyms:
  • antediluvian patriarch
  • ancient
  • fud
  • ante-bellum

Other Word Forms of Antediluvian

Noun

Singular:
antediluvian
Plural:
antediluvians

Origin of Antediluvian

  • From Latin ante- (“before”) +‎ diluvium (“flood”), in reference to the story of Noah’s Ark (Genesis 6–9), an early episode in the Bible.

    From Wiktionary

  • From ante– Latin dīluvium flood diluvial

    From American Heritage Dictionary of the English Language, 5th Edition

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antediluvian