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geosynchronous
geosyncline
geotaxis
geotectonic
geothermal
geothermal energy
geothermal gradient
geotropism
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germ line
germ line (plural germ lines)


noun 
Definition:
 
cells in embryo: a group of cells in a developing embryo from which reproductive cells gametes develop, regarded as the line of descent from one generation to another
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