microbe
Americannoun
noun
Other Word Forms
Etymology
Origin of microbe
1880–85; < French < Greek mīkro- micro- + bíos life
Explanation
Microbe is a somewhat outdated way for scientists to talk about the tiny bugs that cause diseases. When you get the flu, you can blame a microbe. In the nineteenth century, the idea that germs caused illness was brand new, and doctors referred to both germs and microbes interchangeably. The word microorganism is more scientifically precise, and in fact microbe is a shortened form of that long, Greek-rooted word. Mikro means "small," and in microbe it's combined with bios, or "life."
Vocabulary lists containing microbe
Words to Live By: Bio
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Ecology - Middle School
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Earth Science - Middle School
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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.
"Wheat gluten and casein are recognized as safe in a way a microbe is not, in a regulatory sense, so this is an easier way to protect public health," Hsiao said.
From Science Daily • Apr. 7, 2026
To explore this idea, the team cultured a large quantity of P. sanguinis for three days and then extracted the full mixture of metabolites produced by the microbe.
From Science Daily • Nov. 29, 2025
One previous piece of research on Neanderthal DNA also showed that modern humans and Neanderthals shared an oral microbe - a type of bacteria found in our saliva.
From BBC • Nov. 18, 2025
Without significant genetic manipulation, the microbe resists diverting its essential resources to produce something unfamiliar.
From Science Daily • Nov. 3, 2025
What evolutionary benefit does a microbe derive from making us sick in bizarre ways, like giving us genital sores or diarrhea?
From "Guns, Germs, and Steel: The Fates of Human Societies" by Jared M. Diamond
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.
