Relating to geological time periods or environments about which little is known; also referring to life forms from poorly understood ancient eras.
From Greek agnostos (unknown) + zoe (life) + -ic, a specialized paleontological term for epochs or organisms that remain scientifically mysterious.
When paleontologists call something 'agnotozoic,' they're basically admitting 'we found weird fossils from this time period and we're still scratching our heads trying to figure out what they are.'
Complete word intelligence in one call. Free tier — 50 lookups/day.