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From The Collaborative International Dictionary of English v.0.48:
Geognosy \Ge*og"no*sy\, n. [Gr. ge`a, gh^, the earth + gnw^sis knowing, knowledge, fr. gignw`skein to know: cf. F. g['e]ognosie.] That part of geology which treats of the materials of the earth's structure, and its general exterior and interior constitution. Geogonic