[mahy-kruh-graf, -grahf]
an instrument for executing extremely minute writing or engraving.
Optics. a photograph taken through a microscope or a drawing of an object as seen through a microscope.

1870–75; micro- + -graph

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World English Dictionary
micrograph (ˈmaɪkrəʊˌɡrɑːf, -ˌɡræf)
1.  a photograph or drawing of an object as viewed through a microscope
2.  an instrument or machine for producing very small writing or engraving

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American Heritage
Medical Dictionary

micrograph mi·cro·graph (mī'krə-grāf')

  1. A drawing or photographic reproduction of an object as viewed through a microscope.

  2. An instrument for measuring minute movements by recording photographically corresponding movements registered by a diaphragm moving in unison with the original object.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
micrograph   (mī'krə-grāf')  Pronunciation Key 
A drawing or photograph taken from an image formed by a microscope.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Mycobacterium tuberculosis under scanning electron micrograph.
Clostridium difficile, seen in a colorized micrograph, produces a toxin that
  can cause intestinal disease.
The scanning electron micrograph of the ash particle reminds me of similar
  pictures of regolith.
Micrograph of a low malignant mucinous ovarian tumor.
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