microorganisms
n. plural-onlyn. living things that are so small you can only see them with a microscope. This includes things like bacteria and some types of fungi.
n. microscopic organisms, such as bacteria, viruses, or fungi, that exist as single cells or cell clusters. Often used in the context of biology, medicine, and ecology.
Microorganisms live in almost every environment on Earth.
Scientists study the microorganisms found in soil to understand how they help plants grow and stay healthy.
The human microbiome consists of trillions of microorganisms that play a vital role in digestion, immune function, and even the regulation of mood through the gut-brain axis.
Typically used in the plural form to refer to a population or category; the singular 'microorganism' is used for a specific individual species or cell.