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Microscopic is a term used to describe those objects smaller than can not be easily seen by the naked eye and which require a lens or microscope to see them clearly. By convention it is also used to describe classes of objects which are most commonly too small to see but of which some members are large enough to be observed with the eye. Such groups include the Cladocera, planktonic green algae of which Volvox is readily observable, and the protozoa of which Stentor can be easily seen without aid.

Microscopic is also by association used to classify and describe the units and measurements relevant to very small objects. The antonym to microscopic is macroscopic

The units used to describe objects on a microscopic length scale are most commonly the Micrometer (µm) - one thousandth of 1 metre and smaller units.

Microscopic is also commonly used as a hyperbole in the English language to describe small objects of a class that would be expected to be bigger - as in "Her feet are microscopic!"