| Noun | 1. | antediluvian - any of the early patriarchs who lived prior to the Delugepatriarch - any of the early Biblical characters regarded as fathers of the human race | |
| 2. | antediluvian - a very old (or old fashioned) person | |
| Adj. | 1. | antediluvian - of or relating to the period before the Biblical flood; "Antediluvian man" | |
| 2. | antediluvian - so extremely old as seeming to belong to an earlier period; "a ramshackle antediluvian tenement"; "antediluvian ideas"; "archaic laws"old - of long duration; not new; "old tradition"; "old house"; "old wine"; "old country"; "old friendships"; "old money" | |