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gerbil
GERD
gerenuk
gerfalcon
geriatric
geriatrics
germ
germ cell
germ layer
germ line
germ theory
germ tube
germ warfare
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germ layer
germ lay·er (plural germ lay·ers)


noun 
Definition:
 
layer of embryo cells: any of the three distinct layers of cells formed during an embryo's early stages of development gastrulation
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