Main Entry: an·te·di·lu·vi·an

Pronunciation: \ˌan-ti-də-ˈlü-vē-ən, -(ˌ)dī-\

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