orbicule

noun

or·​bi·​cule

ˈȯ(r)bəˌkyül

plural -s

: 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

Word History

Etymology

Latin orbiculus small disk, diminutive of orbis disk, circle

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