An interesting and humorous metaphorical description of something (for example a productThe result of a manufacturing or natural process (such as fo... or service or conceptA thought or notion. An idea for a new product, advertising ...) that is obsolete, old-fashioned or primitive, or devised a long time ago. ‘Ante’ is Latin for ‘before’, and ‘diluvian’ is from Latin ‘diluvium’ meaning ‘deluge’, so the overall literal meaning is ‘before the flood’, being the biblical flood and Noah’s Ark, etc. AntediluvianAn interesting and humorous metaphorical description of some... is therefore a clever way to say that something is (so old as to be) ‘out of the Ark’.