adj.
Pronunciation: ˌ an-ti-d ə - ' lü-v ē - ə n, -( ˌ )d ī -
Function: adjective
Etymology: ante- + Latin diluvium flood ― more at DELUGE
Date: 1646
1 : of or relating to the period before the flood described in the Bible
2 a : made, evolved, or developed a long time ago <an antediluvian automobile> b : extremely primitive or outmoded <an antediluvian prejudice>
– antediluvian noun