Definition of "antediluvian" []

• Extremely old and antiquated. See Synonyms at old. (adjective)
• Bible Occurring or belonging to the era before the Flood. (adjective)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "The doctor armed himself, and held himself in readiness to fire upon an animal which, by its dimensions, recalled the antediluvian quadrupeds."
• "Parker also complains that British (military) ambulances are "antediluvian" and "reveals" that the laboratory at Camp Bastion in Afghanistan, which is used to match blood and test samples, had to close between 11.30am and 3.30pm because the air-conditioning system could not keep the temperature below 97F (36C)."
• "Sally Keeble, MP for Northampton North, thought the ban epitomised  'the complete nonsense of an institution that won't move on', and Barbara Follett, MP for Stevenage, talked of 'antediluvian' attitudes."