| geode | (noun) (mineralogy) a hollow rock or nodule with the cavity usually lined with crystals | - |
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| geodesic | (noun) (mathematics) the shortest line between two points on a mathematically defined surface (as a straight line on a plane or an arc of a great circle on a sphere) | Synonyms: geodesic line |
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| geodesy | (noun) the branch of geology that studies the shape of the earth and the determination of the exact position of geographical points | - |
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| geoduck | (noun) a large edible clam found burrowing deeply in sandy mud along the Pacific coast of North America; weighs up to six pounds; has siphons that can extend to several feet and cannot be withdrawn into the shell | - |
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