geognosy noun. [dʒɪ'ɒgnǝsi] Now chiefly Hist. L18.
[French géognosie, from Greek gēo- GEO- + gnōsis knowledge.]
1. The branch of science that deals with the structure and composition of the earth; loosely geology. L18.

2. The mineralogy of particular rocks (esp. in a region), together with the grouping, distribution and relations of those rocks. E19.

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