Microscopic or Micro (from the Greek: μικρός, mikrós, "small" and σκοπέω, skopéō, "look") is a term used to describe objects smaller than those that can easily be 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. The term "submicroscopic" is a similar term used to describe objects which are too small to see with any optical microscope.
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!"