geognostic
/ˌdʒiːə(ʊ)ɡˈnɒstɪk/ /dʒɪəɡˈnɒstɪk/Now chiefly historical
adjective
Of or relating to geognosy; geological.
Origin
Late 18th century; earliest use found in Richard Kirwan (1733–1812), chemist and mineralogist. From geo- + gnostic, after German geognostisch or post-classical Latin geognosticus. Compare French géognostique.