microscopic
Americanadjective
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so small as to be invisible or indistinct without the use of the microscope.
microscopic organisms.
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very small; tiny.
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of, relating to, or involving a microscope.
microscopic investigation.
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very detailed; meticulous.
a microscopic view of society.
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suggestive of the precise use of the microscope; minute.
microscopic exactness.
adjective
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not large enough to be seen with the naked eye but visible under a microscope Compare macroscopic
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very small; minute
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of, concerned with, or using a microscope
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characterized by or done with great attention to detail
Other Word Forms
Etymology
Origin of microscopic
First recorded in 1670–80; microscope + -ic
Explanation
Skin cells, bacteria, and some kinds of algae are all microscopic, or too small to see without a microscope. Use the adjective microscopic to describe things that are so tiny you can't see them. The word is a scientific term if you literally mean "can be seen with a microscope," although people use it sometimes to mean "really small," as in the phrase "Wow, your feet are microscopic." Mikros means "small" in Greek, and the scope part of the word comes from the Greek word skopein, "to examine."
Vocabulary lists containing microscopic
Cell Biology - Middle School
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Cell Biology - High School
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It's the Little Things: Synonyms for "Small"
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Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
They have been the unlikeliest powerhouse imaginable for nearly two decades, perennially reaching the playoffs despite microscopic payrolls that consistently rank among the lowest in the sport.
From The Wall Street Journal • May 22, 2026
Interpreted this way, the Einstein–Rosen bridge acts as a mirror in spacetime: a connection between two microscopic arrows of time.
From Science Daily • May 22, 2026
This compact book weaves together topics including the microscopic quantum tunneling required for nuclear fusion and the macroscopic geometry of spacetime.
From The Wall Street Journal • May 19, 2026
To explore how temperature affects magnetization removal in maze domains, the researchers captured microscopic images of the magnetic domains in the RIG sample at different temperatures.
From Science Daily • May 18, 2026
Before taking off, he was informed that the first microscopic quantity of U-235 had been separated from natural uranium in the thirty-seven-inch cyclotron.
From "Big Science" by Michael Hiltzik
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
