orbicule

noun
or·​bi·​cule | \ ˈȯ(r)bəˌkyül\
plural -s

Definition of orbicule

: a more or less spherical body found in some granites and other rocks, varying in size from a pellet visible only under the microscope to a sphere 10 feet or more in diameter, and having its constituents arranged in concentric shells

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History and Etymology for orbicule

Latin orbiculus small disk, diminutive of orbis disk, circle

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