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Too small to be seen by the unaided eye but large enough to be studied under a microscope.
(adjective)
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Of, relating to, or concerned with a microscope.
(adjective)
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Exceedingly small; minute: "The activities of men . . . were reduced to a microscopic scale” ( John Hersey).
(adjective)
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Characterized by or done with extreme attention to detail: a microscopic investigation.
(adjective)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.