Related Terms. Long-term (maturity over 10 years) fixed interest rate debt security issued by a national (federal) government backed by its 'full faith and credit.' Next to treasury bills (maturity less than one year), and treasury notes (maturity one to ten years) T-bonds are the safest form of marketable investment.
bacteria [pl. of bacterium], microscopic unicellular prokaryotic organisms characterized by the lack of a membrane-bound nucleus and membrane-bound organelles. Once considered a part of the plant kingdom, bacteria were eventually placed in a separate kingdom, Monera.
Microorganism. Definition. noun, plural: microorganisms. An organism that is microscopic or submicroscopic, which means it is too small to be seen by the unaided human eye. Supplement.Microorganisms were first observed by Anton van Leeuwenhoek in 1675 using a microscope of his own design.Examples of microorganisms include bacteria, fungi, archaea, and protists.Viruses and prions, although microscopic, are not considered microorganisms by others because they are generally regarded as non-living. Word origin: Related forms: microorganic, microoganismal (adjective).xamples of microorganisms include bacteria, fungi, archaea, and protists. Viruses and prions, although microscopic, are not considered microorganisms by others because they are generally regarded as non-living. Word origin: Related forms: microorganic, microoganismal (adjective).