You are correct!
From our dictionary:
1. of or belonging to the period before the Flood. Gen. 7, 8.
2. very old, old-fashioned, or out of date; antiquated; primitive: antediluvian ideas.
1. a person who lived before the Flood.
2. a very old or old-fashioned person or thing.
About Infoplease, Part of Family Education Network
© 2000–2013 Pearson Education, publishing as Infoplease