DILUVIAL Meaning of DILUVIAL in English [ dʌɪ'l(j)u:vɪəl , dɪ- ](also diluvian ) ■ adjective relating to a flood or floods, especially the biblical Flood.OriginC17: from late L. ~is , from diluvium 'deluge'. Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004