microorganisms

Cultural  

1. Organisms so small that they can be seen only through a microscope. (See bacteria, protozoa, and viruses.)

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Example Sentences

Up to 80 per cent of colorectal cancer risk is thought to be influenced by environmental factors, including the microorganisms in the gut.

From Science Daily • Apr. 22, 2026

Western drywood termites are native to North America and play a real role in nature by helping break down dead wood above ground with help from microorganisms in their guts.

From Science Daily • Apr. 20, 2026

In his rare blend, which ages for four years, umami lingers, not saltiness, and the barrels’ microorganisms lend to the complex taste.

From The Wall Street Journal • Apr. 15, 2026

"The latest theory is related to some of the chemistry that goes into ensuring that the wastewater doesn't develop any biofilms," or microorganisms, he said.

From Barron's • Apr. 9, 2026

Medical men and even the general public were becoming aware that the human environment was inhabited by an enormous number of microorganisms capable of causing disease, just as today carcinogens pervade our surroundings.

From "Silent Spring" by Rachel Carson