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
Keep scrolling for more