Microscopic \Mi`cro*scop"ic\, Microscopical \Mi`cro*scop"ic*al\, a. [Cf. F. microscopique.]

1. Of or pertaining to the microscope or to microscopy; made with a microscope; as, microscopic observation.

2. Able to see extremely minute objects.

Why has not man a microscopic eye? --Pope.

3. Very small; visible only by the aid of a microscope; as, a microscopic insect.

Source: Webster's Revised Unabridged Dictionary (1913)