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

Allen had a test run on her infant’s gut microbiome—the collection of bacteria and other microorganisms that inhabit the digestive tract.

From The Wall Street Journal • Mar. 3, 2026

When lake levels are high, microorganisms more effectively consume methane before it can reach the atmosphere.

From Science Daily • Feb. 24, 2026

"We know that the microorganisms that produce oxygen were around well before the Great Oxidation Event," Husain says.

From Science Daily • Feb. 18, 2026

This enormous and constantly changing community of microorganisms is shaped by countless chemical exchanges, both among the microbes themselves and between microbes and the human body.

From Science Daily • Feb. 8, 2026

It has recently been reported that the nucleic acid of chloroplasts is, in fact, homologous with that of certain photosynthetic microorganisms.

From "The Lives of a Cell" by Lewis Thomas