ge·og·nost \ˈjēˌägˌnäst, ˈjēəg-; jēˈägˌnäst, -_nəst\noun alsoge·og·no·sist\jēˈägnəsə̇st\ (-s) Etymology:geognost from French géognoste, from géo- ge- + Greek gnōstēs one that knows, from gignōskein to know; geognosist from geognosy + -ist : a specialist in geognosy