| a. | 1. | Of or relating to the period before the Deluge in Noah's time; hence, antiquated; |
| Noun | 1. | antediluvian - any of the early patriarchs who lived prior to the Deluge Synonyms: antediluvian patriarch |
| 2. | antediluvian - a very old (or old fashioned) person | |
| Adj. | 1. | antediluvian - of or relating to the period before the Biblical flood; "Antediluvian man" Synonyms: antediluvial |
| 2. | antediluvian - so extremely old as seeming to belong to an earlier period; "a ramshackle antediluvian tenement"; "antediluvian ideas"; "archaic laws" Synonyms: antiquated, archaic |