antediluvian
adj.
"before Noah's flood," 1640s, formed from Latin ante- "before" (see ante) + diluvium "a flood" (see deluge, n.). Coined by English physician Sir Thomas Browne (1605-1682). As a noun meaning "person who lived before the Flood," from 1680s.
〔李〕[ante-=before 前；diluv=to wash away 冲走；-ian a.=being⇒“before being washed away 被冲走…前的”→] a．①before the Flood（基督圣经中所说的）大洪水以前的 ②very old 古老的