n. [ Micro- + photograph. ] [ 1913 Webster ]

1. A microscopically small photograph of a picture, writing, printed page, etc. [ 1913 Webster ]

2. An enlarged representation of a microscopic object, produced by throwing upon a sensitive plate the magnified image of an object formed by a microscope or other suitable combination of lenses. [ 1913 Webster ]

☞ A picture of this kind is preferably called a photomicrograph. [ 1913 Webster ]

n. The art of making microphotographs. [ 1913 Webster ]