An organism which cannot be observed with the naked eye; e. g. unicellular animals, lower algae, lower fungi, bacteria.
A microscopic organism; applied particularly to bacteria. The word “microbe” was coined by Monsieur Sedillot, a colleague of Louis Pasteur.
A minute living organism, especially pathogenic bacteria, viruses, etc.
A microscopic organism, particularly bacteria, viruses, fungi, and protozoa.
A microorganism which may cause disease and which can only be seen with a microscope, e.g. a bacterium.
Small organism, visible only with a microscope.
Any living organism so small it can be viewed only under a microscope. Often, the word is used to describe disease-causing organisms, such as viruses, bacteria, protozoa, and fungi. The words microbe and microorganism have the same meaning. Also, the study of microbes is called microbiology.
A unicellular or small multicellular organism including bacteria, protozoa, some algae and fungi, viruses, and some worms, especially those that are injurious to other organisms.
A minute organism, particularly a bacterium, responsible for the onset of illnesses.
A commonly used phrase referring to a microorganism, especially one that is responsible for causing diseases.
A tiny living organism, typically microscopic, often referring specifically to microscopic life forms that can induce illness.