(microbiology) An organism that is too small to be seen by the unaided eye, especially a single-celled organism, such as a bacterium.
‘The cud is then reswallowed and further digested by specialized microorganisms that live in the rumen.’;
(biology) The branch of biology that deals with microorganisms, especially their effects on man and other living organisms.
Any microscopic form of life; a form of life too small to be seen by the naked eye; - particularly applied to bacteria, protozoa, yeasts, and similar organisms, esp. such are supposed to cause infectious diseases.
The branch of biology studying minute organisms, or microbes, such as the bacteria, fungi, viruses, and protozoa.
any organism of microscopic size
the branch of biology that studies microorganisms and their effects on humans
A microorganism, or microbe, is a microscopic organism, which may exist in its single-celled form or a colony of cells. The possible existence of unseen microbial life was suspected from ancient times, such as in Jain scriptures from sixth century BC India.
Microbiology (from Greek μῑκρος, mīkros, βίος, bios, and -λογία, -logia) is the scientific study of microorganisms, those being unicellular (single cell), multicellular (cell colony), or acellular (lacking cells). Microbiology encompasses numerous sub-disciplines including virology, bacteriology, protistology, mycology, immunology and parasitology.