antediluvial

Early 18th c., ante- +‎ diluvial, possibly as alteration of earlier antediluvian.^[1]

• (UK) IPA^(key): /ˌantɪdɪˈluːvɪəl/

antediluvial (comparative more antediluvial, superlative most antediluvial)

1. (biblical) Of or pertaining to a time before Noah's flood.

   Synonyms: antediluvian, prediluvian

2. (rare) Antiquated.

   Synonyms: antediluvian, defunct, outdated; see also Thesaurus:obsolete