plural germs
1
a
: a small mass of living substance capable of developing into an organism or one of its parts
b
: the embryo with the scutellum of a cereal grain that is usually separated from the starchy endosperm during milling
2
: something that initiates development or serves as an origin : rudiments, beginning
3
: a microorganism causing disease : a pathogenic agent (such as a bacterium or virus)
broadly : microorganism

Examples of germ in a Sentence

the germ that causes tuberculosis the germ of an idea the germ layers of an embryo
Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Drinking alcohol will not help to kill germs in your body. Amelia MacIntyre, Verywell Health, 14 Mar. 2025 Raw milk cheeses are those made with milk that hasn’t been heat-treated, or pasteurized, to kill germs. Brenda Goodman, CNN, 14 Mar. 2025 An even smaller fraction—about 8 percent—had installed air-cleansing systems that incorporated ultraviolet light, which can kill germs. Roxanne Khamsi, The Atlantic, 11 Mar. 2025 Since then scientists and doctors have had some success in taming germs, thanks to the twin wonders of vaccines and treatments, Tomes says. Meghan Bartels, Scientific American, 7 Mar. 2025 See All Example Sentences for germ

Word History

Etymology

French germe, from Latin germin-, germen, from gignere to beget — more at kin

First Known Use

circa 1550, in the meaning defined at sense 2

Time Traveler
The first known use of germ was circa 1550

Browse Nearby Words

Cite this Entry

“Germ.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/germ. Accessed 23 Mar. 2025.

Kids Definition

germ

noun
1
a
: a small mass of living substance capable of developing into a whole individual or one of its parts
b
: the embryo in the seed of a cereal (as corn or wheat) together with its cotyledon that is usually separated from the starchy part of the seed during milling
2
: something that serves as an origin
the germ of an idea
3
: a microscopic living thing
especially : one that causes disease

Medical Definition

germ

noun
1
: a small mass of living substance capable of developing into an organism or one of its parts
2
: a microorganism causing disease : a pathogenic agent (as a bacterium or virus)
broadly : microorganism

More from Merriam-Webster on germ

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