| geochemistry | (noun) the chemistry of the earth's crust | - |
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| 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the Pacific coast of North America; weighs up to six pounds; has siphons that can extend to several feet and cannot be withdrawn into the shell | - |
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| geographer | (noun) an expert on geography | - |
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| geographics | (noun) study of the earth's surface; includes people's responses to topography and climate and soil and vegetation | Synonyms: geography |
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| geography | (noun) study of the earth's surface; includes people's responses to topography and climate and soil and vegetation | Synonyms: geographics |
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| geologist | (noun) a specialist in geology | - |
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| geology | (noun) a science that deals with the history of the earth as recorded in rocks | - |
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| geomancer | (noun) one who practices geomancy | - |
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| geomancy | (noun) divination by means of signs connected with the earth (as points taken at random or the arrangement of particles thrown down at random or from the configuration of a region and its relation to another) | - |
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| geometer | (noun) a mathematician specializing in geometry | Synonyms: geometrician |
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| geometrician | (noun) a mathematician specializing in geometry | Synonyms: geometer |
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| geometrid | (noun) slender-bodied broad-winged moth whose larvae are called measuring worms | Synonyms: geometrid moth |
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| geometry | (noun) the pure mathematics of points and lines and curves and surfaces | - |
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| geomorphology | (noun) the branch of geology that studies the characteristics and configuration and evolution of rocks and land forms | Synonyms: morphology |
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| geophagia | (noun) eating earth, clay, chalk; occurs in some primitive tribes, sometimes in cases of nutritional deficiency or obsessive behavior | Synonyms: geophagy |
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| geophagy | (noun) eating earth, clay, chalk; occurs in some primitive tribes, sometimes in cases of nutritional deficiency or obsessive behavior | Synonyms: geophagia |
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| geophysicist | (noun) a geologist who uses physical principles to study the properties of the earth | - |
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| geophysics | (noun) geology that uses physical principles to study properties of the earth | Synonyms: geophysical science |
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| geophyte | (noun) a perennial plant that propagates by underground bulbs or tubers or corms | - |
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| geopolitics | (noun) the study of the effects of economic geography on the powers of the state | - |
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| geordie | (noun) the nonstandard dialect of natives of Newcastle-upon-Tyne | - |
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| georgette | (noun) a thin silk dress material | - |
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| geosphere | (noun) the solid part of the earth consisting of the crust and outer mantle | Synonyms: lithosphere |
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| geostrategy | (noun) the branch of geopolitics dealing with strategy | - |
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| geotropism | (noun) an orienting response to gravity | - |
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