mi·cro·scop·ic (mī′krə-skŏpĭk) also mi·cro·scop·i·cal (-ĭ-kəl)
a. Too small to be seen by the unaided eye but large enough to be studied under a microscope.
b. Of, relating to, or concerned with a microscope.
2. Exceedingly small; minute: "The activities of men ... were reduced to a microscopic scale" (John Hersey).
3. Characterized by or done with extreme attention to detail: a microscopic investigation.
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2019 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.