The term 'Azoic' is an adjective used to describe something that is very old or ancient. It is derived from the Greek word 'azōikos', which means 'LIFELESS'. In the context of a crossword puzzle, it could refer to something that is INANIMATE, or not alive. This could be anything from a rock to a fossilized organism. In general, the term is used to describe something that has been around for a very long time and has not changed much over the years.